Arrange the following in decreasing order of reactivity towards Aromatic Nucleophilic Substitution (): (I), (II), (III).

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Question

Arrange the following in decreasing order of reactivity towards Aromatic Nucleophilic Substitution ($S_NAr$): $Ar-F$ (I), $Ar-Cl$ (II), $Ar-Br$ (III).

Prashant Kotian · Accepted Answer

Correct answer: A. In the Addition-Elimination () mechanism, the rate-determining step is nucleophilic attack to form a carbanion. The extreme inductive effect of Fluorine highly stabilizes this carbanion, making react fastest.

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