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 becuase of strong bonding.

Question

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 becuase of strong bonding. (A) Both (A) and (R) are wrong statements (B) Both (A) and (R) are correct statements and (R) is the 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.

Tardigrade Admin · Accepted Answer

Vinyl halide CH2=CH-Cl do not undergo SN reaction This is due to formation of highly unstable carbocation (CH2 = C⊕H) ; which cannot be delocalised by the π-electron, also C-Cl has double bond character because of resonance

Both (A) and (R) are wrong statements

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

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

(A) is a correct statement but (R) is a wrong statement.

Vinyl halide CH2​=CH−Cl do not undergo SN reaction This is due to formation of highly unstable carbocation (CH2​=C⊕H) ; which cannot be delocalised by the π-electron, also C-Cl has double bond character because of resonance

Vinyl halide $C H_{2} = C H - Cl$ do not undergo SN reaction
This is due to formation of highly unstable carbocation $(C H_{2} = C^{\oplus} H)$ ; which cannot be delocalised by the $π$ -electron, also C-Cl has double bond character because of resonance