Assertion : 4-Nitrochlorobenzene undergoes nu | vedclass

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(A) The Assertion is correct because the presence of an electron-withdrawing $-NO_2$ group at the $para-$position stabilizes the carbanion intermediat

Vedclass · Accepted Answer

If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

Vedclass · Answer

(A) The Assertion is correct because the presence of an electron-withdrawing $-NO_2$ group at the $para-$position stabilizes the carbanion intermediate formed during nucleophilic aromatic substitution.The Reason is also correct. Chlorobenzene typically requires harsh conditions and proceeds via an elimination-addition mechanism (benzyne intermediate) due to the lack of electron-withdrawing groups. In contrast,$4-$nitrochlorobenzene undergoes nucleophilic aromatic substitution via an addition-elimination mechanism (Meisenheimer complex) because the $-NO_2$ group strongly activates the ring towards nucleophilic attack.Since the mechanism described in the Reason explains why $4-$nitrochlorobenzene is more reactive,the Reason is the correct explanation of the Assertion.

Assertion : $4-$Nitrochlorobenzene undergoes nucleophilic substitution more readily than chlorobenzene.
Reason : Chlorobenzene undergoes nucleophilic substitution by elimination-addition mechanism while $4-$nitrochlorobenzene undergoes nucleophilic substitution by addition-elimination mechanism.

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Assertion : $4-$Nitrochlorobenzene undergoes nucleophilic substitution more readily than chlorobenzene.Reason : Chlorobenzene undergoes nucleophilic substitution by elimination-addition mechanism while $4-$nitrochlorobenzene undergoes nucleophilic substitution by addition-elimination mechanism.