JEE Main Chemistry question

[IIT 1990] Aryl halides are less reactive than alkyl halides towards nucleophilic substitution reactions due to

(A)The formation of a less stable carbonium ion
(B)Resonance stabilisation (partial double-bond character in the C–X bond)Correct
(C)A longer carbon–halogen bond
(D)The inductive effect

Answer: (B)

Solution

In an aryl halide, the halogen's lone pair is delocalised into the aromatic ring, giving the C–X bond partial double-bond character; this resonance

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Question ID VK-140310