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  4. Which of the following does not exist as a Zwitter ion?

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Q. Which of the following does not exist as a Zwitter ion?

Biomolecules

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 -COOR group and basic character of $-NH_2$ group decrease. Therefore, the weakly acidic -COOH group cannot transfer a $H^+$ ion to the weakly basic $-NH_2$ group. Thus, o or p-aminobenzoic acids do not exist as Zwitter ion.

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