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 stabilized by loosely held $π$ -electrons, the cleavage is difficult because of strong bonding.

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Both A and R are true but R is not the correct explanation of A.

Both A and R are true and R is the correct explanation of A.

A is false but R is true.

A is true but R is false.

answer is D.

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Detailed Solution

Vinyl halides ${CH}_{2} = CH - Cl$ do not undergo S_N reaction due to formation of highly unstable carbocation $({CH}_{2} = C^{+} H)$ , which cannot be delocalized by $π$ -electron, also C-Cl has double bond character because of resonance. Hence, reason is wrong.