(c) Sulphonation:  Aniline reacts with concentrated sulphuric acid
to form anilinium hydrogensulphate which on heating with
sulphuric acid at 453-473K produces p-aminobenzene sulphonic
acid, commonly known as sulphanilic acid, as the major product Aniline does not undergo Friedel-Crafts reaction (alkylation and
acetylation) due to salt formation with aluminium chloride, the
Lewis acid, which is used as a catalyst Due to this, nitrogen of
aniline acquires positive charge and hence acts as a strong
deactivating group for further reaction Rationalised 2023-24
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Chemistry
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