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  4. Which one of the following compounds can exists in Zwitter ionic form?

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Q. Which one of the following compounds can exists in Zwitter ionic form?

AMUAMU 2016Biomolecules

Solution:

Amino acids contain amino $(—NH_2)$ and carboxyl $(—COOH)$ as functional groups. In aqueous solution, the carboxyl group can lose a proton and amino group can accept a proton, giving rise to a dipolar ion known as Zwitter ion. This is neutral but contains both negative and positive charges.