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.
| 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:
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)