Which of the following does not exist as a Zwitter ion ? – InterviewSolution

1.	Which of the following does not exist as a Zwitter ion ?
Answer» Glycine Glutamic acid Sulphanilic acid p-aminobenzoic acid Solution :o and p- aminobenzoic acids do not exist as Zwitter ion. The LONE pair of electrons on the `NH_2` group is DONATED towards the benzene ring due to resonanace effect. As a result , acidic CHARACTER of -COOH group group and basic character of `-NH_2` group decreases. Therefore, the weakly acidic -COOH group cannot trasnfer `H^+` ion to the weakly basic `-NH_2` group. thus , o or p-aminobenzoic acids do not exist as Zwitter ion .

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