Chemistry Class-11: Chapter –13. Hydrocarbons Part – 8

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

Column I

Column 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

Cyclooctane

The compound cyclooctane

It is cyclic and has conjugated 8π-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)

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