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All questions of Haloalkanes and Haloarenes for NEET Exam
C5H11Br is least soluble in:- a)Ether
- b)Alcohol
- c)Water
- d)None of these
Correct answer is 'C'. Can you explain this answer?
C5H11Br is least soluble in:
a)
Ether
b)
Alcohol
c)
Water
d)
None of these
|
Rajeev Saxena answered |
C5H11Br is only very slightly soluble in water. It is more soluble in organic solvents.
Which of the following is not true about optical isomers?- a)They rotate the plane polarized light.
- b)They are superimposable on their mirror image.
- c)They posses at least one chiral carbon atom.
- d)They are nonsuperimposable on their mirror image.
Correct answer is option 'B'. Can you explain this answer?
Which of the following is not true about optical isomers?
a)
They rotate the plane polarized light.
b)
They are superimposable on their mirror image.
c)
They posses at least one chiral carbon atom.
d)
They are nonsuperimposable on their mirror image.
|
Nisha Pillai answered |
Explanation:
Optical isomers are stereoisomers that exist in two mirror-image forms that are non-superimposable on each other. They are also known as enantiomers.
a) They rotate the plane polarized light: Optical isomers have the property of rotating the plane of polarized light in opposite directions. One isomer rotates the plane of polarized light in the clockwise direction and the other in the counterclockwise direction.
b) They are superimposable on their mirror image: This statement is false. Optical isomers are non-superimposable mirror images of each other. If we try to superimpose them, they will not match perfectly.
c) They possess at least one chiral carbon atom: Optical isomers possess chiral carbon atoms. Chiral carbon atoms are those carbon atoms that are attached to four different groups or atoms.
d) They are nonsuperimposable on their mirror image: As mentioned earlier, optical isomers are non-superimposable mirror images of each other. They have the same physical and chemical properties but differ in their biological activity, as they interact differently with other chiral molecules in living organisms.
Conclusion: Optical isomers are important in fields like medicinal chemistry, where knowing the activity of each isomer can help in designing drugs that are more effective and have fewer side effects. Therefore, it is crucial to understand the properties of optical isomers.
Optical isomers are stereoisomers that exist in two mirror-image forms that are non-superimposable on each other. They are also known as enantiomers.
a) They rotate the plane polarized light: Optical isomers have the property of rotating the plane of polarized light in opposite directions. One isomer rotates the plane of polarized light in the clockwise direction and the other in the counterclockwise direction.
b) They are superimposable on their mirror image: This statement is false. Optical isomers are non-superimposable mirror images of each other. If we try to superimpose them, they will not match perfectly.
c) They possess at least one chiral carbon atom: Optical isomers possess chiral carbon atoms. Chiral carbon atoms are those carbon atoms that are attached to four different groups or atoms.
d) They are nonsuperimposable on their mirror image: As mentioned earlier, optical isomers are non-superimposable mirror images of each other. They have the same physical and chemical properties but differ in their biological activity, as they interact differently with other chiral molecules in living organisms.
Conclusion: Optical isomers are important in fields like medicinal chemistry, where knowing the activity of each isomer can help in designing drugs that are more effective and have fewer side effects. Therefore, it is crucial to understand the properties of optical isomers.
Which of the following is a tertiary halogenoalkanes?- a)2-Bromopentane
- b)2-Bromo 3-methylpentane
- c)Bromopentane
- d)2-Bromo 2-methylpentane
Correct answer is option 'D'. Can you explain this answer?
Which of the following is a tertiary halogenoalkanes?
a)
2-Bromopentane
b)
2-Bromo 3-methylpentane
c)
Bromopentane
d)
2-Bromo 2-methylpentane
|
Anaya Patel answered |
√Br CH3 -( CH )- CH2 - CH2 - CH3 √CH3 The carbon with which the Br is bonded is bonded with another 3 carbon atoms. So haloalkane is 3.
The reaction of CH3OC2H5 with one mole HI gives- a)CH3OH
- b)C2H5OH
- c)CH3I + C2H5OH
- d)C2H5I + CH3OH
Correct answer is option 'B'. Can you explain this answer?
The reaction of CH3OC2H5 with one mole HI gives
a)
CH3OH
b)
C2H5OH
c)
CH3I + C2H5OH
d)
C2H5I + CH3OH
|
Mira Joshi answered |
The correct answer is option C
When ethers are treated with a strong acid in the presence of a nucleophile, they can be cleaved to give alcohols and alkyl halides. If the ether is on a primary carbon this may occur through an SN2 pathway. The reaction of CH3OC2H5 with HI gives CH3I+C2H5OH.
When ethers are treated with a strong acid in the presence of a nucleophile, they can be cleaved to give alcohols and alkyl halides. If the ether is on a primary carbon this may occur through an SN2 pathway. The reaction of CH3OC2H5 with HI gives CH3I+C2H5OH.
Which of the following compound does have chiral carbon atom?- a)(CH3)2CHCH2CH2Br
- b)CH3CH2CH2CH (Br)CH3
- c)CH3CH2CH(Br) CH2CH3
- d)CH3CH2CH2 CH2Br
Correct answer is 'B'. Can you explain this answer?
Which of the following compound does have chiral carbon atom?
a)
(CH3)2CHCH2CH2Br
b)
CH3CH2CH2CH (Br)CH3
c)
CH3CH2CH(Br) CH2CH3
d)
CH3CH2CH2 CH2Br
|
Geetika Shah answered |
The correct answer is Option B.
The chiral carbon atom is one in which there are an unequal number of carbon atoms, this happens only in option (B) as it forms a non superimposable mirror image.
Which of the following is intermediate in Sandmeyer’s reaction?- a)Diazonium salt
- b)Hydronium ion
- c)Ammonium salt
- d)Nitronium ion
Correct answer is option 'A'. Can you explain this answer?
Which of the following is intermediate in Sandmeyer’s reaction?
a)
Diazonium salt
b)
Hydronium ion
c)
Ammonium salt
d)
Nitronium ion
|
|
Rajeev Saxena answered |
Diazonium salt is intermediate in Sandmeyer’s reaction.
Paul Muller of Geigy Pharmaceuticals in Switzerland discovered the effectiveness of DDT as:- a)Insecticides
- b)Fertilizers
- c)Anaesthetics
- d)Antiseptics
Correct answer is option 'A'. Can you explain this answer?
Paul Muller of Geigy Pharmaceuticals in Switzerland discovered the effectiveness of DDT as:
a)
Insecticides
b)
Fertilizers
c)
Anaesthetics
d)
Antiseptics
|
|
Mira Joshi answered |
The correct answer is Option A.
Paul Hermann Muller, Swiss chemist who received the Nobel Prize for Physiology or Medicine in 1948 for discovering the potent toxic effects on insects of DDT. With its chemical derivatives, DDT became the most widely used insecticide for more than 20 years and was a major factor in increased world food production and the suppression of insect-borne diseases.
Paul Hermann Muller, Swiss chemist who received the Nobel Prize for Physiology or Medicine in 1948 for discovering the potent toxic effects on insects of DDT. With its chemical derivatives, DDT became the most widely used insecticide for more than 20 years and was a major factor in increased world food production and the suppression of insect-borne diseases.
Reactivity of alkyl halides towards SN1 nucleophilic substitution reaction is:- a)3° > 2° > 1°
- b)3° < 2° < 1°
- c)2° < 1° < 3°
- d)3° < 1° < 2°
Correct answer is option 'A'. Can you explain this answer?
Reactivity of alkyl halides towards SN1 nucleophilic substitution reaction is:
a)
3° > 2° > 1°
b)
3° < 2° < 1°
c)
2° < 1° < 3°
d)
3° < 1° < 2°
|
|
Swati Verma answered |
The correct answer is option A
Reactivity of alkyl halides towards SN1 nucleophilic substitution reaction is 3o > 2o > 1o because in SN1 nucleophilic reaction, the first and the slow step is the formation of a carbocation. Tertiary carbocation is more stable than a secondary carbocation which is more stable than a primary carbocation. Greater the stability of the carbocation, greater will be the ease of formation of carbocation, and hence faster will be the rate of the reaction.
Reactivity of alkyl halides towards SN1 nucleophilic substitution reaction is 3o > 2o > 1o because in SN1 nucleophilic reaction, the first and the slow step is the formation of a carbocation. Tertiary carbocation is more stable than a secondary carbocation which is more stable than a primary carbocation. Greater the stability of the carbocation, greater will be the ease of formation of carbocation, and hence faster will be the rate of the reaction.
Read the assertion and reason carefully to mark the correct option out of the options given below:
Assertion: Optically active 2-iodobutane on treatment with NaI in acetone undergoes racemization.
Reason: Repeated Walden inversions on the reactant and its product eventually gives a racemic mixture.- a)If both assertion and reason are true and the reason is the correct explanation of the assertion.
- b)If both assertion and reason are true but reason is not the correct explanation of the assertion.
- c)If assertion is true but reason is false.
- d)If the assertion and reason both are false.
- e)If assertion is false but reason is true.
Correct answer is option 'A'. Can you explain this answer?
Read the assertion and reason carefully to mark the correct option out of the options given below:
Assertion: Optically active 2-iodobutane on treatment with NaI in acetone undergoes racemization.
Reason: Repeated Walden inversions on the reactant and its product eventually gives a racemic mixture.
Assertion: Optically active 2-iodobutane on treatment with NaI in acetone undergoes racemization.
Reason: Repeated Walden inversions on the reactant and its product eventually gives a racemic mixture.
a)
If both assertion and reason are true and the reason is the correct explanation of the assertion.
b)
If both assertion and reason are true but reason is not the correct explanation of the assertion.
c)
If assertion is true but reason is false.
d)
If the assertion and reason both are false.
e)
If assertion is false but reason is true.
|
Abhishek Mishraclasses answered |
Optically active 2-iodobutane on treatment with NaI in acetone undergoes racemisation.
Repeated Walden inversions on the reactant and its product eventually gives a racemic mixture.
Repeated Walden inversions on the reactant and its product eventually gives a racemic mixture.
Which one of the following is likely to give a precipitate with AgNO3 solution?- a)CHCl3
- b)(CH3)3CCl
- c)CH2=CH-Cl
- d)CCl4
Correct answer is option 'B'. Can you explain this answer?
Which one of the following is likely to give a precipitate with AgNO3 solution?
a)
CHCl3
b)
(CH3)3CCl
c)
CH2=CH-Cl
d)
CCl4
|
|
Gargi Ahuja answered |
Precipitation Reaction
A precipitation reaction is a chemical reaction that produces a precipitate, which is an insoluble solid that forms from the reaction of two soluble compounds.
AgNO3 Solution
AgNO3 is a soluble salt that dissociates to give Ag+ and NO3- ions in an aqueous solution.
Likely Precipitate
A compound is likely to give a precipitate with AgNO3 solution if it contains Cl- ions, as AgCl is insoluble in water and will form a white precipitate.
Analysis of Options
a) CHCl3
CHCl3 does not contain Cl- ions and will not give a precipitate with AgNO3 solution.
b) (CH3)3CCl
(CH3)3CCl contains Cl- ions and will give a precipitate with AgNO3 solution.
c) CH2=CH-Cl
CH2=CH-Cl does not contain Cl- ions and will not give a precipitate with AgNO3 solution.
d) CCl4
CCl4 does not contain Cl- ions and will not give a precipitate with AgNO3 solution.
Conclusion
Out of the given options, only (CH3)3CCl contains Cl- ions and will give a precipitate with AgNO3 solution, making option 'B' the correct answer.
A precipitation reaction is a chemical reaction that produces a precipitate, which is an insoluble solid that forms from the reaction of two soluble compounds.
AgNO3 Solution
AgNO3 is a soluble salt that dissociates to give Ag+ and NO3- ions in an aqueous solution.
Likely Precipitate
A compound is likely to give a precipitate with AgNO3 solution if it contains Cl- ions, as AgCl is insoluble in water and will form a white precipitate.
Analysis of Options
a) CHCl3
CHCl3 does not contain Cl- ions and will not give a precipitate with AgNO3 solution.
b) (CH3)3CCl
(CH3)3CCl contains Cl- ions and will give a precipitate with AgNO3 solution.
c) CH2=CH-Cl
CH2=CH-Cl does not contain Cl- ions and will not give a precipitate with AgNO3 solution.
d) CCl4
CCl4 does not contain Cl- ions and will not give a precipitate with AgNO3 solution.
Conclusion
Out of the given options, only (CH3)3CCl contains Cl- ions and will give a precipitate with AgNO3 solution, making option 'B' the correct answer.
Decreasing order of reactivity of alkyl halide is:- a)RI > RCl > RBr
- b)RI > RBr > RCl
- c)RBr > RCl > RI
- d)RCl > RBr > RI
Correct answer is option 'B'. Can you explain this answer?
Decreasing order of reactivity of alkyl halide is:
a)
RI > RCl > RBr
b)
RI > RBr > RCl
c)
RBr > RCl > RI
d)
RCl > RBr > RI
|
|
Anu Sharma answered |
The decreasing order of reactivity of alkyl halides is based on the ease with which they undergo nucleophilic substitution reactions.
Order of Reactivity:
The alkyl halides can be arranged in the decreasing order of reactivity as follows:
R-I > R-Br > R-Cl
Explanation:
The reactivity of alkyl halides towards nucleophilic substitution reactions is influenced by the following factors:
1. The nature of the halogen:
The reactivity of alkyl halides decreases in the order: iodide > bromide > chloride. This is because the size of the halogen increases down the group, leading to a decrease in the bond strength and an increase in the polarizability of the C-X bond. As a result, the carbon-halogen bond becomes more susceptible to nucleophilic attack.
2. The nature of the alkyl group:
The reactivity of alkyl halides increases with increasing branching of the alkyl group. This is because the steric hindrance caused by the bulky alkyl groups makes it difficult for the nucleophile to approach the carbon atom, leading to a decrease in the reaction rate.
3. The nature of the nucleophile:
The reactivity of alkyl halides towards nucleophilic substitution reactions is also influenced by the nature of the nucleophile. Generally, stronger nucleophiles are more reactive towards alkyl halides.
Based on the above factors, the decreasing order of reactivity of alkyl halides is:
R-I > R-Br > R-Cl
Hence, option B is the correct answer.
Order of Reactivity:
The alkyl halides can be arranged in the decreasing order of reactivity as follows:
R-I > R-Br > R-Cl
Explanation:
The reactivity of alkyl halides towards nucleophilic substitution reactions is influenced by the following factors:
1. The nature of the halogen:
The reactivity of alkyl halides decreases in the order: iodide > bromide > chloride. This is because the size of the halogen increases down the group, leading to a decrease in the bond strength and an increase in the polarizability of the C-X bond. As a result, the carbon-halogen bond becomes more susceptible to nucleophilic attack.
2. The nature of the alkyl group:
The reactivity of alkyl halides increases with increasing branching of the alkyl group. This is because the steric hindrance caused by the bulky alkyl groups makes it difficult for the nucleophile to approach the carbon atom, leading to a decrease in the reaction rate.
3. The nature of the nucleophile:
The reactivity of alkyl halides towards nucleophilic substitution reactions is also influenced by the nature of the nucleophile. Generally, stronger nucleophiles are more reactive towards alkyl halides.
Based on the above factors, the decreasing order of reactivity of alkyl halides is:
R-I > R-Br > R-Cl
Hence, option B is the correct answer.
Which of the following is major product of following reaction?
CH3CH = CH2 + HBr 
- a)2-Bromo propene
- b)1-Bromo propane
- c)1-Bromo propene
- d)2-Bromo propane
Correct answer is option 'D'. Can you explain this answer?
Which of the following is major product of following reaction?
CH3CH = CH2 + HBr
CH3CH = CH2 + HBr
a)
2-Bromo propene
b)
1-Bromo propane
c)
1-Bromo propene
d)
2-Bromo propane
|
Knowledge Hub answered |
The correct answer is Option D.
As HBr in the presence of a peroxide follows antimarkonikoff rule where the negative group should attach to the carbon having less no of hydrogen atoms.
As HBr in the presence of a peroxide follows antimarkonikoff rule where the negative group should attach to the carbon having less no of hydrogen atoms.
Which of the following alcohols will yield the corresponding alkyl chloride on reaction with concentrated HCl at room temperature?- a)
- b)
- c)
- d)
Correct answer is option 'D'. Can you explain this answer?
Which of the following alcohols will yield the corresponding alkyl chloride on reaction with concentrated HCl at room temperature?
a)
b)
c)
d)
|
Vivek Rana answered |
Option D is correct.
At room temperature more stable carbocation is formed by any alkyl halide then that will give a stable and more efficient product.
Formation of 3o carbocation as intermediate during reaction which is highly stable,this reaction does not require any heating to occur at only room temperature.
At room temperature more stable carbocation is formed by any alkyl halide then that will give a stable and more efficient product.
Formation of 3o carbocation as intermediate during reaction which is highly stable,this reaction does not require any heating to occur at only room temperature.
Arrange the following compounds in order of decreasing rate of hydrolysis for SN1 reaction(I) 
(II) 
(III) 
(IV) 
- a)II > III > IV > I
- b)IV > III > II > I
- c)III > IV > II > I
- d)I > II > III > IV
Correct answer is option 'A'. Can you explain this answer?
Arrange the following compounds in order of decreasing rate of hydrolysis for SN1 reaction
(I)
(II)
(III)
(IV)
(II)
(III)
(IV)
a)
II > III > IV > I
b)
IV > III > II > I
c)
III > IV > II > I
d)
I > II > III > IV
|
EduRev Support answered |
Order of decreasing rate of hydrolysis for SN1 reaction in SN1 reaction intermediate corbocation is formed.
decreasing stability order of following corbocation.
decreasing stability order of following corbocation.
The chloro compound which can be used as fire extinguisher is:- a)CH3Cl
- b)COCl2
- c)CCl4
- d)CHCl3
Correct answer is option 'C'. Can you explain this answer?
The chloro compound which can be used as fire extinguisher is:
a)
CH3Cl
b)
COCl2
c)
CCl4
d)
CHCl3
|
Om Desai answered |
The correct answer is Option C.
Its use in the home as a spot remover should be avoided because of its poisonous nature.
Because it's vapours (incombustible vapours) are denser than air which leads to a smoother flame.
Because it's vapours (incombustible vapours) are denser than air which leads to a smoother flame.
Racemic mixture is obtained due to the halogenation of- a)n-pentane
- b)isopentane
- c)neopentane
- d)Both (a) and (b)
Correct answer is 'D'. Can you explain this answer?
Racemic mixture is obtained due to the halogenation of
a)
n-pentane
b)
isopentane
c)
neopentane
d)
Both (a) and (b)
|
|
Sreemoyee Choudhury answered |
If free radical halogenation generate a chiral carbon, racemic mixture of halides are always formed due to equal probability of halogenation from both sides of planar free radical.
Which one of the following compounds has zero dipole moment?- a)CCl4
- b)CH3Cl
- c)CHI3
- d)CHCl3
Correct answer is option 'A'. Can you explain this answer?
Which one of the following compounds has zero dipole moment?
a)
CCl4
b)
CH3Cl
c)
CHI3
d)
CHCl3
|
Abhijeet Sharma answered |
Explanation:
A dipole moment is the measure of the separation of positive and negative charges in a molecule. It is a vector quantity and has both magnitude and direction. When the molecule has a polar covalent bond, it has a dipole moment. If the bond dipoles cancel out each other, then the molecule is nonpolar, and its dipole moment is zero.
The given compounds are:
a) CCl4
b) CH3Cl
c) CHI3
d) CHCl3
Now, let's analyze each compound based on its molecular geometry and bond polarity to determine its dipole moment.
a) CCl4:
CCl4 has a tetrahedral molecular geometry with four C-Cl bonds arranged symmetrically around the central carbon atom. The C-Cl bond is polar covalent, with chlorine being more electronegative than carbon. However, due to the symmetry of the molecule, the bond dipoles cancel out each other, resulting in a net dipole moment of zero. Therefore, CCl4 has zero dipole moment.
b) CH3Cl:
CH3Cl has a trigonal pyramidal molecular geometry with three C-H bonds and one C-Cl bond. The C-Cl bond is polar covalent, with chlorine being more electronegative than carbon. The three C-H bonds are also polar covalent, with carbon being more electronegative than hydrogen. However, due to the asymmetrical arrangement of the bonds, the bond dipoles do not cancel out each other, resulting in a net dipole moment. Therefore, CH3Cl has a dipole moment.
c) CHI3:
CHI3 has a tetrahedral molecular geometry with three I-H bonds and one I-C bond. The I-C bond is polar covalent, with iodine being more electronegative than carbon. The three I-H bonds are also polar covalent, with iodine being more electronegative than hydrogen. However, due to the symmetry of the molecule, the bond dipoles cancel out each other, resulting in a net dipole moment of zero. Therefore, CHI3 has zero dipole moment.
d) CHCl3:
CHCl3 has a tetrahedral molecular geometry with three C-H bonds and one C-Cl bond. The C-Cl bond is polar covalent, with chlorine being more electronegative than carbon. The three C-H bonds are also polar covalent, with carbon being more electronegative than hydrogen. However, due to the asymmetrical arrangement of the bonds, the bond dipoles do not cancel out each other, resulting in a net dipole moment. Therefore, CHCl3 has a dipole moment.
Conclusion:
Among the given compounds, CCl4 has zero dipole moment because the bond dipoles cancel out each other due to the symmetrical arrangement of the bonds around the central atom.
A dipole moment is the measure of the separation of positive and negative charges in a molecule. It is a vector quantity and has both magnitude and direction. When the molecule has a polar covalent bond, it has a dipole moment. If the bond dipoles cancel out each other, then the molecule is nonpolar, and its dipole moment is zero.
The given compounds are:
a) CCl4
b) CH3Cl
c) CHI3
d) CHCl3
Now, let's analyze each compound based on its molecular geometry and bond polarity to determine its dipole moment.
a) CCl4:
CCl4 has a tetrahedral molecular geometry with four C-Cl bonds arranged symmetrically around the central carbon atom. The C-Cl bond is polar covalent, with chlorine being more electronegative than carbon. However, due to the symmetry of the molecule, the bond dipoles cancel out each other, resulting in a net dipole moment of zero. Therefore, CCl4 has zero dipole moment.
b) CH3Cl:
CH3Cl has a trigonal pyramidal molecular geometry with three C-H bonds and one C-Cl bond. The C-Cl bond is polar covalent, with chlorine being more electronegative than carbon. The three C-H bonds are also polar covalent, with carbon being more electronegative than hydrogen. However, due to the asymmetrical arrangement of the bonds, the bond dipoles do not cancel out each other, resulting in a net dipole moment. Therefore, CH3Cl has a dipole moment.
c) CHI3:
CHI3 has a tetrahedral molecular geometry with three I-H bonds and one I-C bond. The I-C bond is polar covalent, with iodine being more electronegative than carbon. The three I-H bonds are also polar covalent, with iodine being more electronegative than hydrogen. However, due to the symmetry of the molecule, the bond dipoles cancel out each other, resulting in a net dipole moment of zero. Therefore, CHI3 has zero dipole moment.
d) CHCl3:
CHCl3 has a tetrahedral molecular geometry with three C-H bonds and one C-Cl bond. The C-Cl bond is polar covalent, with chlorine being more electronegative than carbon. The three C-H bonds are also polar covalent, with carbon being more electronegative than hydrogen. However, due to the asymmetrical arrangement of the bonds, the bond dipoles do not cancel out each other, resulting in a net dipole moment. Therefore, CHCl3 has a dipole moment.
Conclusion:
Among the given compounds, CCl4 has zero dipole moment because the bond dipoles cancel out each other due to the symmetrical arrangement of the bonds around the central atom.
Which of the following compound will not give addition reaction with bromine?- a)Propene
- b)1-Butene
- c)Iso butane
- d)Iso butene
Correct answer is option 'C'. Can you explain this answer?
Which of the following compound will not give addition reaction with bromine?
a)
Propene
b)
1-Butene
c)
Iso butane
d)
Iso butene
|
|
Om Desai answered |
The correct answer is Option C.
For Addition reaction π bond is required .Iso butane has no pi Bond .
Which of the following is formed in reaction mechanism of halogenation of alkanes in presence of UV light?- a)Carbocation
- b)Carbanion
- c)Diazonium ion
- d)Free radical
Correct answer is option 'D'. Can you explain this answer?
Which of the following is formed in reaction mechanism of halogenation of alkanes in presence of UV light?
a)
Carbocation
b)
Carbanion
c)
Diazonium ion
d)
Free radical
|
Niloni Soni answered |
In presence of uv light free radical mechanism takes place that is homolytic cleavage of covalent bond takes place. Carbocation and carbanion and diazonium ion forms when heterolytic cleavage of bond takes place.
The inversion of configuration of optically active alkyl halides occurs in- a)SN1 nucleophilic substitution reaction
- b)SN2 electrophilic substitution reaction
- c)SN2 nucleophilic substitution reaction
- d)SN1 electrophilic substitution reaction
Correct answer is option 'C'. Can you explain this answer?
The inversion of configuration of optically active alkyl halides occurs in
a)
SN1 nucleophilic substitution reaction
b)
SN2 electrophilic substitution reaction
c)
SN2 nucleophilic substitution reaction
d)
SN1 electrophilic substitution reaction
|
|
Suresh Iyer answered |
The correct answer is option C
Nucleophilic substitution reaction on an optically active alkyl halide gives a mixture of enantiomers.
Because the reaction occurs by SN1 mechanism.
SN1 mechanism involves racemisation as the nucleophile can attack from either side. In SN2 reaction, inversion of configuration is involved as the nucleophile can attack from the opposite side.
Nucleophilic substitution reaction on an optically active alkyl halide gives a mixture of enantiomers.
Because the reaction occurs by SN1 mechanism.
SN1 mechanism involves racemisation as the nucleophile can attack from either side. In SN2 reaction, inversion of configuration is involved as the nucleophile can attack from the opposite side.
The antiseptic properties of iodoform is due to which of the following:- a)Liberation of iodine
- b)Smell of iodoform
- c)Colour of iodoform
- d)None of the above
Correct answer is option 'A'. Can you explain this answer?
The antiseptic properties of iodoform is due to which of the following:
a)
Liberation of iodine
b)
Smell of iodoform
c)
Colour of iodoform
d)
None of the above
|
|
Alok Verma answered |
The antiseptic properties of iodoform is due to liberation of iodine.
Chlorination of ethane is carried out in presence of- a)anhydrous AlBr3
- b)mercuric chloride
- c)ultraviolet light
- d)zinc chloride
Correct answer is option 'C'. Can you explain this answer?
Chlorination of ethane is carried out in presence of
a)
anhydrous AlBr3
b)
mercuric chloride
c)
ultraviolet light
d)
zinc chloride
|
Top Rankers answered |
The correct answer is option C
Chlorination of ethane is carried out in the presence of Ultraviolet light to form 1,2-hexachloroethane.
CH3CH3 ----- UVlight ----> CCl3CCl3
So, the correct answer is C.
Chlorination of ethane is carried out in the presence of Ultraviolet light to form 1,2-hexachloroethane.
CH3CH3 ----- UVlight ----> CCl3CCl3
So, the correct answer is C.
. 
This reaction is known as:- a)Wurtz reaction
- b)Frankland reaction
- c)Fittig reaction
- d)Finkelstein reaction
Correct answer is option 'D'. Can you explain this answer?
.
This reaction is known as:
This reaction is known as:
a)
Wurtz reaction
b)
Frankland reaction
c)
Fittig reaction
d)
Finkelstein reaction
|
Hansa Sharma answered |
The correct answer is option D
where, X=Cl or Br.
This reaction is known as the Finkelstein reaction. Finkelstein's reaction is used to prepare alkyl iodides starting from alkyl chlorides and alkyl bromides.
where, X=Cl or Br.
This reaction is known as the Finkelstein reaction. Finkelstein's reaction is used to prepare alkyl iodides starting from alkyl chlorides and alkyl bromides.
Which of the following is the major product of following reaction?
CH3CH = CH2 + HBr in the presence of peroxide gives:- a)2 – bromopropane
- b)1 – bromopropene
- c)1 – bromopropane
- d)2 – bromopropene
Correct answer is option 'C'. Can you explain this answer?
Which of the following is the major product of following reaction?
CH3CH = CH2 + HBr in the presence of peroxide gives:
CH3CH = CH2 + HBr in the presence of peroxide gives:
a)
2 – bromopropane
b)
1 – bromopropene
c)
1 – bromopropane
d)
2 – bromopropene
|
|
Garima Kunwar answered |
In presence of HBr and peroxide anti markonikov's addition in supported. Hence 1-bromopropane will we major product
Exposure to lower levels of a compound in air can lead to slightly impaired hearing and vision. Identify the compound.- a)Chloroform
- b)Chloromethane
- c)Carbon tetrachloride
- d)Methylene chloride
Correct answer is option 'D'. Can you explain this answer?
Exposure to lower levels of a compound in air can lead to slightly impaired hearing and vision. Identify the compound.
a)
Chloroform
b)
Chloromethane
c)
Carbon tetrachloride
d)
Methylene chloride
|
Learners Habitat answered |
The correct answer is Option D.
Methylene chloride (Dichloromethane) Dichloromethane, also known as methylene chloride, is one of the polyhalogen compounds present in the form of solvent. Low levels of methylene chloride exposure in the air can cause slight hearing and vision impairment.
Which of the following is not an aryl halide?- a)m-ClCH2C6H4CH2C(CH3)3
- b)(CH3)3CCH2CH3
- c)o-Br-C6H4CH(CH3)CH2CH3
- d)p-ClC6H4CH2CH(CH3)2
Correct answer is 'B'. Can you explain this answer?
Which of the following is not an aryl halide?
a)
m-ClCH2C6H4CH2C(CH3)3
b)
(CH3)3CCH2CH3
c)
o-Br-C6H4CH(CH3)CH2CH3
d)
p-ClC6H4CH2CH(CH3)2
|
|
Ankita Datta answered |
Because it is Open chain compound /Aliphatic Compound and not aryl halide as does not contain halogen atom. it's alkane simply.
The yield of alkyl bromide obtained as a result of heating the dry silver salt of carboxylic acid with bromine in CCI4 is
a) 1°> 3°> 2° bromides
b) 3 ° > 2° > 1°bromides
c) 1°> 2° > 3° bromides
d) 3 ° > 1°> 2 ° bromidesCorrect answer is option 'B'. Can you explain this answer?
|
|
Shraddha Chavan answered |
The reaction follows free radical mechanism and alkyl free radical is formed in the propagation step as
Hence, stability of alkyl free radical (3° > 2° > 1°) determine the reactivity.
The IUPAC name of chloroform is:- a)Dichloromethane
- b)Trichloromethane
- c)Chloromethane
- d)Carbon tetrachloride
Correct answer is option 'B'. Can you explain this answer?
The IUPAC name of chloroform is:
a)
Dichloromethane
b)
Trichloromethane
c)
Chloromethane
d)
Carbon tetrachloride
|
|
Ameya Pillai answered |
**Explanation:**
The IUPAC name of chloroform is trichloromethane. Let's break down the name and understand why it is called trichloromethane.
**1. Basic Structure:**
The basic structure of chloroform consists of a single carbon atom bonded to three chlorine atoms and one hydrogen atom. This can be represented as CHCl3.
**2. Naming Rules:**
According to the IUPAC naming rules for organic compounds, the longest carbon chain in the structure should be identified. In the case of chloroform, there is only one carbon atom, so the longest chain is just one carbon long.
**3. Naming Prefixes:**
The prefixes used in IUPAC nomenclature indicate the number of substituents attached to the main carbon chain. Here, the prefix "tri-" is used because there are three chlorine atoms attached to the carbon atom.
**4. Naming Suffix:**
The suffix in the IUPAC name indicates the functional group present in the compound. Since chloroform contains a single carbon atom bonded to three chlorine atoms, it is classified as a halomethane. Therefore, the suffix used is "-ane."
**Putting it all together:**
Based on the above rules, the IUPAC name for chloroform is trichloromethane. The prefix "tri-" indicates the presence of three chlorine substituents, and the suffix "-ane" indicates that it is a halomethane compound.
Therefore, the correct answer is option **B) Trichloromethane**.
The IUPAC name of chloroform is trichloromethane. Let's break down the name and understand why it is called trichloromethane.
**1. Basic Structure:**
The basic structure of chloroform consists of a single carbon atom bonded to three chlorine atoms and one hydrogen atom. This can be represented as CHCl3.
**2. Naming Rules:**
According to the IUPAC naming rules for organic compounds, the longest carbon chain in the structure should be identified. In the case of chloroform, there is only one carbon atom, so the longest chain is just one carbon long.
**3. Naming Prefixes:**
The prefixes used in IUPAC nomenclature indicate the number of substituents attached to the main carbon chain. Here, the prefix "tri-" is used because there are three chlorine atoms attached to the carbon atom.
**4. Naming Suffix:**
The suffix in the IUPAC name indicates the functional group present in the compound. Since chloroform contains a single carbon atom bonded to three chlorine atoms, it is classified as a halomethane. Therefore, the suffix used is "-ane."
**Putting it all together:**
Based on the above rules, the IUPAC name for chloroform is trichloromethane. The prefix "tri-" indicates the presence of three chlorine substituents, and the suffix "-ane" indicates that it is a halomethane compound.
Therefore, the correct answer is option **B) Trichloromethane**.
Consider the following reaction,
Q. The expected product(s) is/are- a)
- b)
- c)
- d)
Correct answer is option 'A,B,C,D'. Can you explain this answer?
Consider the following reaction,
Q.
The expected product(s) is/are
a)
b)
c)
d)
|
Infinity Academy answered |
NBS in CCI4 brings about allylic brom ination by free radical mechanism:
Pick out the most reactive alkyl halide for an SN1 reaction.- a)
- b)
- c)
- d)
Correct answer is option 'A'. Can you explain this answer?
Pick out the most reactive alkyl halide for an SN1 reaction.
a)
b)
c)
d)
|
|
Vivek Rana answered |
Tertiary halide would be most reactive in SN1 reaction.
Comprehension TypeDirection (Q. Nos. 13-15) This section contains a paragraph, describing theory, experiments, data, etc.
Three questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).PassageAn alcohol (R — OH) can be converted into alkyl chloride by the treatm ent with HCI. Reaction involves protonation of alcohol followed by the formation of carbocation intermediate. Carbocation intermediate in the final step undergo nucleophilic attack by Cl- ion as :
Q. Which of the following alcohol reacts most easily?- a)
- b)
- c)
- d)
Correct answer is 'C'. Can you explain this answer?
Comprehension Type
Direction (Q. Nos. 13-15) This section contains a paragraph, describing theory, experiments, data, etc.
Three questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).
Three questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).
Passage
An alcohol (R — OH) can be converted into alkyl chloride by the treatm ent with HCI. Reaction involves protonation of alcohol followed by the formation of carbocation intermediate. Carbocation intermediate in the final step undergo nucleophilic attack by Cl- ion as :
Q.
Which of the following alcohol reacts most easily?
a)
b)
c)
d)
|
|
Om Desai answered |
As mentioned in mechanism, reaction proceed via carbocation intermediate. Hence, alcohol forming most stable carbocation reacts most easily. Alcohol (c) forms aromatic (highly stable) carbocation, hence most reactive.
On reacting ethene with HCl we get:- a)Chloroethane
- b)Chloropropane
- c)Chloromethane
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
On reacting ethene with HCl we get:
a)
Chloroethane
b)
Chloropropane
c)
Chloromethane
d)
None of these
|
Divey Sethi answered |
hydrogen chloride adds to ethene to make chloroethane:
CH2=CH2 + HCl → CH3CH2Cl
Which is the correct formula of Freon-12?- a)CCl2F2
- b)CClF3
- c)CHCl2F
- d)CCl3F
Correct answer is option 'A'. Can you explain this answer?
Which is the correct formula of Freon-12?
a)
CCl2F2
b)
CClF3
c)
CHCl2F
d)
CCl3F
|
|
Chirag Joshi answered |
Formula of Freon-12 (CCl2F2)
Introduction:
Freon-12, also known as Dichlorodifluoromethane, is a chlorofluorocarbon (CFC) compound. It was widely used as a refrigerant in air conditioning and refrigeration systems until it was phased out due to its harmful effects on the ozone layer. The molecular formula of Freon-12 is CCl2F2.
Explanation:
Freon-12 is composed of carbon, chlorine, and fluorine atoms. Let's break down the molecular formula and understand the composition of each element in the compound:
C:
The element symbol C represents carbon. Carbon is a non-metal and forms covalent bonds with other non-metallic elements in compounds. In Freon-12, there are two carbon atoms present.
Cl:
The element symbol Cl represents chlorine. Chlorine is also a non-metal and forms covalent bonds. In Freon-12, there are two chlorine atoms present.
F:
The element symbol F represents fluorine. Fluorine is a highly reactive non-metal and also forms covalent bonds. In Freon-12, there are two fluorine atoms present.
Overall Formula:
Combining the carbon, chlorine, and fluorine atoms, we obtain the molecular formula of Freon-12: CCl2F2.
Summary:
The correct formula of Freon-12 is option A, CCl2F2. This formula accurately represents the composition of carbon, chlorine, and fluorine atoms in the compound. It is important to note that Freon-12 has been phased out due to its harmful effects on the ozone layer, and alternative refrigerants are now used in air conditioning and refrigeration systems.
Introduction:
Freon-12, also known as Dichlorodifluoromethane, is a chlorofluorocarbon (CFC) compound. It was widely used as a refrigerant in air conditioning and refrigeration systems until it was phased out due to its harmful effects on the ozone layer. The molecular formula of Freon-12 is CCl2F2.
Explanation:
Freon-12 is composed of carbon, chlorine, and fluorine atoms. Let's break down the molecular formula and understand the composition of each element in the compound:
C:
The element symbol C represents carbon. Carbon is a non-metal and forms covalent bonds with other non-metallic elements in compounds. In Freon-12, there are two carbon atoms present.
Cl:
The element symbol Cl represents chlorine. Chlorine is also a non-metal and forms covalent bonds. In Freon-12, there are two chlorine atoms present.
F:
The element symbol F represents fluorine. Fluorine is a highly reactive non-metal and also forms covalent bonds. In Freon-12, there are two fluorine atoms present.
Overall Formula:
Combining the carbon, chlorine, and fluorine atoms, we obtain the molecular formula of Freon-12: CCl2F2.
Summary:
The correct formula of Freon-12 is option A, CCl2F2. This formula accurately represents the composition of carbon, chlorine, and fluorine atoms in the compound. It is important to note that Freon-12 has been phased out due to its harmful effects on the ozone layer, and alternative refrigerants are now used in air conditioning and refrigeration systems.
What is the order of reactivity of following halogen acids on alcohols?
HI, HBr, HCl- a)HI < HBr < HCl
- b)HI > HBr > HCl
- c)HI > HCl > HBr
- d)HBr > HCl> HI
Correct answer is option 'B'. Can you explain this answer?
What is the order of reactivity of following halogen acids on alcohols?
HI, HBr, HCl
HI, HBr, HCl
a)
HI < HBr < HCl
b)
HI > HBr > HCl
c)
HI > HCl > HBr
d)
HBr > HCl> HI
|
|
Mira Sharma answered |
That atomic size increases from F to I, so bond length of H-X bond also gets increased and so bond dissociation energy decreases. Hence, ionisation of H-X increases, therefore acidic strength increases in the order
HF < HCl < HBr < HI
So, the reactivity of alcohols towards haloacids is in the order - HI>HBr>HCl
Which among the following is true?- a)Freon does not initiate radical chain reactions in stratosphere.
- b)Iodoform initiates radical chain reactions in stratosphere.
- c)Freon initiates radical chain reactions in stratosphere.
- d)Chloroform initiates radical chain reactions in stratosphere.
Correct answer is option 'C'. Can you explain this answer?
Which among the following is true?
a)
Freon does not initiate radical chain reactions in stratosphere.
b)
Iodoform initiates radical chain reactions in stratosphere.
c)
Freon initiates radical chain reactions in stratosphere.
d)
Chloroform initiates radical chain reactions in stratosphere.
|
|
Learners Habitat answered |
The correct answer is Option C.
Freon (Eg: CFCl3 – Freon11) does initiate radical chain reactions in the stratosphere, which can upset the ozone layer.
Freon (Eg: CFCl3 – Freon11) does initiate radical chain reactions in the stratosphere, which can upset the ozone layer.
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