IIT JEE Revision Benzene Sulphonation

The product is a combination Benzene and SO-3H that displaced one hydrogen atom from benzene.

For sulphonation we require excess of conc. H-2SO-4 along with SO-3(Fuming sulphuric acid or oleum)

Sulphonation can also be carried by treating benzene with chlorosulphonic acid(ClSO3H). The product is benzene sulphonic acid