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Assertion & Reason Test: Hydrocarbons - NEET MCQ


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10 Questions MCQ Test - Assertion & Reason Test: Hydrocarbons

Assertion & Reason Test: Hydrocarbons for NEET 2024 is part of NEET preparation. The Assertion & Reason Test: Hydrocarbons questions and answers have been prepared according to the NEET exam syllabus.The Assertion & Reason Test: Hydrocarbons MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion & Reason Test: Hydrocarbons below.
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Assertion & Reason Test: Hydrocarbons - Question 1
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Match the reagent from Column I which on reaction with CH3—CH = CH2 gives some product given in Column II as per the codes given below:

Detailed Solution for Assertion & Reason Test: Hydrocarbons - Question 1

(i) O3/Zn + H2O - Two carbonyl compounds are obtained on ozonolysis of alkene

(ii) KMnO4/H+ - Propene gives CH3COOH and CO2 on reacting with KMnO4 in an acidic medium.

(iii) KMnO4/OH– - Alkaline KMnO4 is decolourised by propene.

(iv) H2O/H+ - Propanol-2 is obtained when H2O is added to propene

(v) B2H6/NaOH and H2O2 - Propanol-1 is obtained as a product.

Assertion & Reason Test: Hydrocarbons - Question 2
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Match the following reactants in Column I with the corresponding reaction products in Column II.

Detailed Solution for Assertion & Reason Test: Hydrocarbons - Question 2

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Assertion & Reason Test: Hydrocarbons - Question 3
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Match the reactions given in Column I with the reaction types in Column II.

Detailed Solution for Assertion & Reason Test: Hydrocarbons - Question 3

  • In reaction (i) H2O molecule added to alkene and formation of ethanol, which is a example of hydration reaction. In reaction

  • (ii) one H2 molecule add with ethylene formation of ethane. The reaction where H2 reacts with a compound in presence of Pd catalyst is called hydrogenation reaction. In reaction

  • (iii) Cl2 molecule add to ethylene formation of dichloro compound. This type of halogen addition reactions are termed as halogenation reaction.

  • In reaction (iv) 3 ethyne molecule act as a monomer unit, which combine and forming cyclic benzene molecule. So, this type of reaction where joining of molecule and forming products is called polymerisation reaction.

Assertion & Reason Test: Hydrocarbons - Question 4
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Match the hydrocarbons in Column I with the boiling points given in Column II.
Detailed Solution for Assertion & Reason Test: Hydrocarbons - Question 4

(i) n–Pentane: In n-pentane there is no branching and surface area. Hence , more Vander Waal's forces. Therefore , boiling point is high.

(ii) iso-Pentane: Molar mass is same but one branch is there which reduces its surface area. Hence the boiling point is less.

(iii) neo-Pentane: In this compound two sides chain are there having the same molar mass. Therefore , its boiling point is lowest amongst all three compounds.

Assertion & Reason Test: Hydrocarbons - Question 5
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In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A) : The compound cyclooctane has the following structural formula :

It is cyclic and has a conjugated 8π-electron system but it is not an aromatic compound.

Reason (R) : (4n + 2) π electrons rule does not hold good and the ring is not planar.

 
Detailed Solution for Assertion & Reason Test: Hydrocarbons - Question 5

Aromaticity is shown by compounds possessing following characteristics:

  • Planarity

  • Complete delocalization of the π electrons in the ring.

  • Presence of (4n+2)π electrons in the ring where n is an integer (4 = 0, 1, 2..)

This is often referred to as Huckel’s Rule.

According to Huckel's Rule, the given compound is Antiaromatic.

Assertion & Reason Test: Hydrocarbons - Question 6
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In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A) : Nitration of benzene with nitric acid requires the use of concentrated sulphuric acid.

Reason (R) : The mixture of concentrated sulphuric acid and concentrated nitric acid produces the electrophile, NO2+.
Detailed Solution for Assertion & Reason Test: Hydrocarbons - Question 6
In nitration , benzene is treating with nitrating mixture , i.e., conc. HNO3 ​and H2​SO4 ​and H2SO4 ​helps in furnishing NO2+ ​(Electrophile).
Assertion & Reason Test: Hydrocarbons - Question 7
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In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A) : Among isomeric pentanes, 2, 2-dimethylpentane has the highest boiling point.

Reason (R) : Branching does not affect the boiling point.
Detailed Solution for Assertion & Reason Test: Hydrocarbons - Question 7
Assertion (A): Among isomeric pentanes, 2, 2-dimethylpentane has lowest boiling point. Reason (R): Branching affects boiling point. More are the branches, lower the boiling point it possess.
Assertion & Reason Test: Hydrocarbons - Question 8
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In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A) : Toluene on Friedel-Crafts methylation gives o– and p–xylene.

Reason (R) : CH3-group bonded to the benzene ring increases electron density at o– and p– position.
Detailed Solution for Assertion & Reason Test: Hydrocarbons - Question 8
Toluene has −CH3 ​group attached to benzene ring. CH3 group is electron withdrawing group which deactivates benzene ring due to hyperconjugation effect and increases electron density on ortho and para positions for the attack of electrophiles.
Assertion & Reason Test: Hydrocarbons - Question 9
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In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion: Saturated hydrocarbons are chemically less reactive.

Reason : All isomeric paraffins have same parent name.
Detailed Solution for Assertion & Reason Test: Hydrocarbons - Question 9
Less reactivity of saturated hydrocarbons is due to the presence of single bonds between carbon atoms. Paraffins (alkanes) may have straight chain or branched chain isomers which have different parent names.
Assertion & Reason Test: Hydrocarbons - Question 10
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In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion : H2O2 has higher boiling point than water.

Reason : H2O2 has stronger dipole-dipole interactions than that shown by water.
Detailed Solution for Assertion & Reason Test: Hydrocarbons - Question 10
H2O2 ​has higher boiling point than water and it is because H2O2 is extensively associated by hydrogen bonding than water or it is more hydrogen bonded than is water.
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