Chemistry Class-11: Chapter – 13. Hydrocarbons Part – 8 Questions and Answers (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question: 43

Match the reactions given in Column I with the reaction types in Column II.

Match the Reactions Given in Column I with the Reaction Types in Column II
Column IColumn II
(i)(a)Hydrogenation
(ii)(b)Halogenation
(iii)(c)Polymerization
(iv)(d)Hydration
(e)Condensation

Answer:

(i) ⇾ (d) (ii) ⇾ (a) (iii) ⇾ (b) (iv) ⇾ (c)

V. Assertion and Reason Type

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.

Question: 44

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

The Compound Cyclooctane

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

Reason (R) :

electrons rule does not hold good and ring is not planar.

(i) Both A and R are correct and R is the correct explanation of A.

(ii) Both A and R are correct but R is not the correct explanation of A.

(iii) Both A and R are not correct.

(iv) A is not correct but R is correct.

Answer: (i)

Question: 45

Assertion (A) : Toluene on Friedel Crafts methylation gives and xylene.

Reason (R) : group bonded to benzene ring increases electron density at o – and p – position.

(i) Both A and R are correct and R is the correct explanation of A.

(ii) Both A and R are correct but R is not the correct explanation of A.

(iii) Both A and R are not correct.

(iv) A is not correct but R is correct.

Answer: (i)

Question: 46

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, .

(i) Both A and R are correct and R is the correct explanation of A.

(ii) Both A and R are correct but R is not the correct explanation of A.

(iii) Both A and R are not correct.

(iv) A is not correct but R is correct

Answer: (i)

Question: 47

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

Reason (R) : Branching does not affect the boiling point.

(i) Both A and R are correct and R is the correct explanation of A. (ii) Both A and R are correct but R is not the correct explanation of A. (iii) Both A and R are not correct. (iv) A is not correct but R is correct.

Answer: (iii)