Arrange the following in decreasing order of reactivity towards Aromatic Nucleophilic Substitution ( — Reaction Mechanism Chemistry Question
Question
Arrange the following in decreasing order of reactivity towards Aromatic Nucleophilic Substitution ($S_NAr$): $Ar-F$ (I), $Ar-Cl$ (II), $Ar-Br$ (III).
Answer: A
💡 Solution & Explanation
In the Addition-Elimination ($S_NAr$) mechanism, the rate-determining step is nucleophilic attack to form a carbanion. The extreme $-I$ inductive effect of Fluorine highly stabilizes this carbanion, making $Ar-F$ react fastest.
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