Alkyl Halides - Result Question 41
####41. An Assertion and a Reason are given below. Choose the correct answer from the following options.
Assertion (A) Vinyl halides do not undergo nucleophilic substitution easily.
Reason (R) Even though the intermediate carbocation is stabilised by loosely held $\pi$-electrons, the cleavage is difficult because of strong bonding. $\quad$ (2019 Main, 12 April II)
(a) Both $(A)$ and $(R)$ are wrong statements.
(b) Both (A) and (R) are correct statements and (R) is correct explanation of $(A)$.
(c) Both (A) and (R) are correct statements but (R) is not the correct explanation of $(A)$.
(d) (A) is a correct statement but (R) is a wrong statement.
Match the Columns
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Answer:
Correct Answer: 41. (d)
Solution:
- Vinyl halide $\left(CH _2=CH-Cl\right)$ do not undergo nucleophilic substitution reactions. This is because it forms highly unstable carbocation $\left(CH _2=\stackrel{\oplus}{C} H\right)$. It cannot delocalise its $\pi$-electron. In vinyl halide $C-Cl$ bond possess double bond character also.
