Resonance structure of chlorobenzene.
Chlorobenzene are less reactive towards nucleophillic reaction due the following reason:
In chlorobenzene the electron pairs are in conjugation with pi electrons of the ring. Thus, C-Cl bond accquires a partial double bond character due to resonance. As a result, the bond cleavage in haloarene is diffcult than chloromethane.
Out of SN1 and SN2, which reaction occurs with
(a) Inversion of configuration
(b) Racemisation
Give reasons:
The presence of nitro group (–NO2) at o/p positions increases the reactivity of haloarenes towards nucleophilic substitution reactions.