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To aniline, we add Sulphuric acid at 180.C. This will give us Sulphanilic acid.

C6H5NH2+H2SO4-------->C6H5 NH3+HSO4-------455 to 475.K----->

C6H5NH2SO3H <=>C6H5NH3+SO3- (zwitter ion)

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Q: How do you Prepare sulphanilic acid from phenyl amine?
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