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31 Year NEET Questions: Some Basic Principles And Techniques- 3 - NEET MCQ


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30 Questions MCQ Test Chemistry 31 Years NEET Chapterwise Solved Papers - 31 Year NEET Questions: Some Basic Principles And Techniques- 3

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31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 1

 The number of possible isomers of the compound with molecular formula C7 H8O is [1995]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 1

The possible isomers of the compound with molecular formula C7H8O is 5. These are

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 2

The IUPAC name of [1996]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 2

When many substituents are present, the numbering is done from the end where the sum of locants is the lowest (lowest sum rule)

2, 5, 6 trimethyl heptane (wrong) 2 + 5 + 6 = 13

2, 3, 6 TriMethyl Heptane (correct)

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31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 3

Huckel's rule states that a monocyclic conjugated compound will be aromatic if it contains [1996]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 3

Huckel’s rule states that for aromaticity there must be (4n + 2)π electron present in compound where n is an integer

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 4

Which of the following will not show cis-trans isomerism? [1996]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 4

Due to presence two similar methyl group at same carbon atom, above compound doesn’t show geometrical isomerism.

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 5

Which of the following will exhibit chirality? [1996]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 5

Due to presence of four different groups on carbon,(C*) it is chiral

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 6

Decreasing order of reactivity to wards nucleophilic addition to carbonyl group among cyclopentanone, 3-pentanone and n-pentanal is [1996]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 6

More is the electron - dificiency of the carbonyl carbon, greater will be the reactivity of the carbonyl compounds towards nucleophilic addition.

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 7

Which one of the following is a technique most suitable for purification of cyclohexanone from a mixture containing benzoic acid, isoamyl alcohol, cyclohexane and cyclohexanone? [1997]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 7

IR spectroscopy is used for the purification of cyclohexanone from a mixture of benzoic acid, isoamyl alcohol, cyclohexane and cyclohexanone. Because in this method, each functional group uppear at a certain peak.
So, cyclohexanone can be identified by carbonyl peak.

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 8

Tautomerism will be exhibited by [1997]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 8

Tautomerism is exhibited by  the oscillation of hydrogen atom between two polyvalent atoms present in the molecule. As option (d) has α-hydrogen atom.  Therefore it shows tautomerism whereas other structures do not.

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 9

The reaction :

is described as [1997]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 9

When (–) 2 bromo octane is allowed to react with sodium hydroxide under given conditions, where second order kinetics are followed, the product obtained is (+) 2 octanol.

In this reaction Walden Inversion takes place so it is an example of SN 2-reaction.

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 10

Which one of these is not compatible with arenes? [1997]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 10

In arenes, π electrons are delocalised, hence arenes do not undergo addition reactions easily. Aromatic compounds (Arenes) are highly stable and show resorance. eg. Benzene is the simplest example.

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 11

 The most stable conformation of n-butane is

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 11

Order of stability : staggered anti > gauche > skew boat > eclipsed.
Newmann projection of n butane is given as

The maximum staggered conformation is most stable in which methyl groups are far apart as for as possible, due to minimum repulsion between methyl groups and is also called anti conformation.

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 12

Among the following compounds (I - III), the ease of their reaction with electrophiles is, [1997]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 12

–OCH3 activates the benzene ring. –NO2 deactivates the ring. Hence the reaction of the given compounds with electrophiles is in the order, I > II > III

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 13

IUPAC name for the compound [1998]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 13

As in this compound the common groups i.e highly electronegative halogen atoms are on opposite side, hence it is a trans isomer.
Thus its name is trans-2-chloro-3-iodo-2-pentene.

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 14

Which one of the following compounds will be most easily attacked by an electrophile? [1998]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 14

—Cl atom sh ows o/p-dir ective influence but deactivate the benzene ring, while [—OH/—CH3] groups show o/p  influence but activate the benzene ring but in these —OH group is more activating than —CH3.
Hence order of electrophilic substitution

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 15

Which of the following compounds is not chiral? [1998]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 15

Due to absence of a symmetric (chiral) C-atom. D — CH2 — CH2 — CH2Cl molecule is not a chiral molecule.

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 16

 Which one of the following compounds is resistant to nucleophilic attack by hydroxyl ions?

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 16

The compound is diethyl ether (CH3CH2)2O which is resistant to nucleophilic attack by hydroxyl ion due to absent of double or triple bond, whereas all other compounds given are unsaturated

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 17

Which one of the following orders is correct regarding the —I effect of the substituents ?

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 17

The atom or group which has more power to attract electrons in comparision to hydrogen is said to have -I effect. Thus higher the electronegativity of atom stronger will be the -I effect. As electronegativity of N, O & F follow the order N < O < F hence  based upon electronegative character order of-I effect is – NR2 < – OR < – F.

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 18

The correct structure of trans-2 hexenal is  [1999]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 18

When similar atoms are on opposite side the compound is in trans-form

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 19

The structural formula of a compoun d is CH3 – CH = C = CH2. The types of hybridization at the four carbons from left to right are

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 19

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 20

Which is a chiral molecule? [1999]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 20

Chiral molecules are those molecules which have atleast one symmetric carbon atom (a carbon atom attached to 4 different groups).
This is true in case of 3-methyl pentanoic acid.

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 21

Consider the following phenols :

The decreasing order of acidity of the above phenols is [1999]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 21

Electron with drawing group (–NO2) increases acidity while electron releasing group (–CH3, –H) decreases acidity. Also effect will be more if functional group present at para position then ortho and meta position.

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 22

Correct order of stability is : [2000]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 22

Stability of an alkene depends upon the heat of hydrogenation of an alkene. The lower the heat of hydrogenation of an alkene higher will be stability.

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 23

Which of the following compounds reacts slower in electrophilic substitution? [2000]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 23

CH3 and NH2 are electron repelling groups, whereas NO2 and OH are electron attracting groups and they leave the benzene ring deactivated. Due to stronger electron attracting (–I effect) effect of NO2 group C6H5NO2 shows least reactivity towards electrophilic substitution.

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 24

A compound of molecular formula of C7H16 shows optical isomerism, compound will be

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 24

A compound is said to exhibi top tical isomerism if it atleast contains one chiral carbon atom, which is an atom bonded to 4 different atoms or groups

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 25

The correct order of acidic strength for following compounds will be [2001]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 25

Electron releasing group (–CH3)decreases acidity while electron withdrawing group (– NO2)increases acidity.

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 26

In steam distillation of toluene, the pressure for toluene in vapour is [2001]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 26

The principle of steam distillation is based on Dalton's law of partial pressures. Suppose p1 and p2 be the vapour pressures of water vapour and the toluene at the distillation temperature. Toluene boils  when total pressure is equal to atmospheric pressure p i.e p  = p1 + p2 or  p2 = p – p1 as a result when toluene boil in  the presence of steam. Its partial pressure p2 is less than atmospheric pressure.

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 27

The incorrect IUPAC name is [2001]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 27

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 28

IUPAC name of the following is [2002]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 28

The IUPAC name of

is Hex-1-en-5-yne or 1-hexene-5-yne The lowest number is given to the C = C double bond.

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 29

[2002]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 29

both are resonating structures.

31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 30

Geometrical isomers differ in [2002]

Detailed Solution for 31 Year NEET Questions: Some Basic Principles And Techniques- 3 - Question 30

Geometrical isomers differ in spatial arrangement of atoms.

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