Question

What is Sn Reactions in Haloarenes?

Answer

Haloarenes are less reactive towards S_n reactions due to the following reasons: (i) Substitution by Hydroxyl Group (ii) Substitution by Cyano Group (iii) Phenyl cation formed as a result of self ionisation will not be stabilized by resonance. (iv) In aryl halide, C-atom holding halogen atom is sp² hybridized. (v) The C-X bond in aryl halides have double bond character due to conjugation between lone pair of halogen and benzene ring.

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