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 a ZWITTER ion. The lone pair of electrons on the `-NH_(2)` group is DONATED towards the benzene ring DUE to resonance effect. As a result, ACIDIC character of -COOH group and basic character of `-NH_(2)` group decrease. therefore the weakly acidic -COOH group cannot transfer a `H^(+)` ion to be weakly basic `-NH_(2)` group. thus o-or p-aminobenzoic acids do not exist as Zwitter ion.

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