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
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