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Why are aryl halides less reactive towards nucleophilic substitution reactions as compared to alkyl halides?

Why are aryl halides less reactive towards nucleophilic substitution reactions as compared to alkyl halides? Correct Answer Sp2-hybridized carbon attached to the halogen

Overlapping of sp2 orbital of carbon with p-orbital of halogen is one of the reasons. Due to conjugation double bond character in alkyl halide.

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