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 However, no effect on reactivity of haloarenes is
observed by the presence of electron withdrawing group at meta-position