The presence of an electron withdrawing group (-NO2) at ortho- and
para-positions increases the reactivity of haloarenes Rationalised 2023-24
183 Haloalkanes and Haloarenes
The effect is pronounced when (-NO2) group is introduced at ortho-
and para- positions However, no effect on reactivity of haloarenes is
observed by the presence of electron withdrawing group at meta-position Mechanism of the reaction is as depicted:
Can you think why does NO2 group show its effect only at ortho- and para- positions
and not at meta- position