Esterification
Alcohols and phenols react with carboxylic acids, acid chlorides and
acid anhydrides to form esters In substituted phenols, the presence of electron withdrawing
groups such as nitro group, enhances the acidic strength of
phenol This effect is more pronounced when such a group is
present at ortho and para positions It is due to the effective
delocalisation of negative charge in phenoxide ion when
substituent is at ortho or para position