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JEE Main levelSingle correct optionDifficulty 2 of 3nc100

When anilinium hydrogensulfate is heated at 453-473 K, the product is

A3-aminobenzenesulfonic acid
B2-aminobenzenesulfonic acid
C4-aminobenzenesulfonic acid (sulfanilic acid), which exists as a zwitterion
Dbenzenesulfonic acid

Answer: C

Baking anilinium hydrogensulfate gives sulfonation mainly at the para position. The product has an acidic

- SO X_{3} H

and a basic

- NH X_{2}

group, so it exists as the zwitterion

H X_{3} N X^{+} - C X_{6} H X_{4} - SO X_{3} X^{-}

.

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