question_answer

Which of the following exists as Zwitter ion?

A)  p-aminophenol               

B)  Salicylic acid

C)  Sulphanilic acid                

D)  Ethanolamine

E)  p-aminoacetophenone

Correct Answer: C

Solution :

                Sulphanilic acid exists as Zwitter ion. It exists as a dipolar ion, which has acidic and basic groups in the same molecule.