Write in brief about reaction steps of sulphonation reaction of benzene ORsulphonation mechanism.

Write in brief about reaction steps of sulphonation reaction of benzen

1.	Write in brief about reaction steps of sulphonation reaction of benzene ORsulphonation mechanism.
Answer» Solution :(a) Steps involved the formation of electrophilic `SO_(3)`. `2H_(2)SO_(4) hArr SO_(3) + 2HSO_(4)^(-) + 2H_(3)O^(+)` (B) Slow step which involved formation of UNSTABLE `sigma` complex (CARBOCATION) in which attachment of electrophilic group. (c) INTERMEDIATE `sigma`-complex quickly donate proton `(H^(+))`, to the `HSO_(4)^(-)` and form benzene sulphonate ionsl which obtain proton from the `H_(3)O^(+)` and form benzene sulphonic ACID.