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Question

Write structures of compounds A and B in each of the following reaction:
1587295_977b64229f374f12a3055c46bc073ae5.png

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Solution

Aniline reacts with concentrated sulphuric acid to form anilinium hydrogensulphate which on heating with sulphuric acid at 453473K produces p-aminobenzene sulphonic acid, commonly known as sulphanilic acid, as the major product.
C6H5NH2Conc.H2SO4−−−−−−C6H5NH3+HSO4(Anilinium hydrogen sulphate)heat 453473K−−−−−−−−−SO3HC6H4NH2(p-aminobenzene sulphonic acid)
Hence the compound A is anilinium hydrogen sulphate and the compound B is p-aminobenzene sulphonic acid.

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