In the addition-elimination mechanism, the active intermediate formed during the rate-determining attack of the nucleophile on an activated haloarene is a:

Question

In the $S_NAr$ addition-elimination mechanism, the active intermediate formed during the rate-determining attack of the nucleophile on an activated haloarene is a:

Prashant Kotian · Accepted Answer

Correct answer: B. The mechanism proceeds via an initial slow addition of the nucleophile to the aromatic ring, generating a resonance-stabilized carbanion intermediate. Electron-withdrawing groups are crucial in order to stabilize this negative charge.

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