JEE Main Chemistry question

[Kerala CEE 2006] Which of the following exists as a Zwitter ion?

(A)p-aminophenol
(B)Salicylic acid
(C)Sulphanilic acidCorrect
(D)Ethanolamine

Answer: (C)

Solution

Sulphanilic acid () carries both a basic amino group and an acidic sulphonic acid group on the same ring, allowing an internal proton transfer to give the dipolar zwitterion

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Question ID VK-150675