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Aniline on heating with fuming sulphuric acid gives 

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Aniline on heating with fuming sulphuric acid gives 

(a) Aniline sulphate 

(b) Aniline disulphate 

(c) Aniline-2, 4-disulphonic acid 

(d) Sulphanilic acid

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(d) Sulphanilic acid

When aniline is treated with cold concentrated sulphuric acid, anilinium hydrogen sulphate is obtained. This on heating with concentrated sulfuric acid at 453 K to 473 K gives p-aminobenzene sulphonic acid which is also known as sulphanilic acid.

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