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Chlorobenzene is extremely less reactive...

Chlorobenzene is extremely less reactive towards nucleophilic substitution reaction. Give two reasons for the same.

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(i). The `C-Cl` bond has partial double bond character on account of conjugation.
(ii). The carbon atom in `C-Cl` bond is `sp^(2)` hybridised and is therefore, sufficiently electronegative in nature. Therefore, the bond cleavage is quite difficult.
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