(iv) Because of the possible repulsion, it is less likely for the electron
rich nucleophile to approach electron rich arenes Replacement by hydroxyl group
Chlorobenzene can be converted into phenol by heating in aqueous
sodium hydroxide solution at a temperature of 623K and a pressure
of 300 atmospheres 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