Question
Explain about the suiphonation reaction of aniline.
✓
Answer
Aniline reacts with Conc. $H _2 SO _4$ to form anilinium hydrogen sulphate which on heating with $H _2 SO _4$ at 453 - 473 K gives p - aminobenzene suiphonic acid, commonly known as suiphanilic acid, as the major product.
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