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2 , aryl halides do not undergo substitution via SN2 mechanism as the carbon attached to the chlorine is Sp2 hybridised so too much steric crowding as well as electron cloud repulsion from the benzene ring , while they do not undergo Substitution via Sn1 mechanism as there is a partial double bond character in C-X bond as well as the C+ formed would be too unstable, apart from comparison between aryl halides and alkyl halides, exceptionally Aryl halide undergoes SnAr(substitution of nucleophile on aromatic ring) which obviously aryl halides do not
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