Question

arrange the folllowing in the increasing order of acid strength -

1.benzene

2.nitrobenzene

3.chlorobenzene

4.anisole.

Answer 1

The acid strength is decreased by an electron donating group and increased by an electron withdrawing group.Nitro group shows –I and –R effect.Chloro group has –I and +R effect whereas methoxy group in anisole has +I and +R effect.Therefore, the order of acidity is as follows:

Anisole < benzene < chlorobenzene < nitrobenzene.