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  4. Zwitter ion is:

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Q. Zwitter ion is:

ManipalManipal 2001Biomolecules

Solution:

The compounds having both $- NH _{2}$ and - COOH groups exists as Zwitter ion.
Amino acids contains both groups.
Hence they exists as Zwitter ion.
$\underset{\text{Glycine}}{H _{2} NCH _{2} COOH} = H _{3} N ^{+}- \underset{\text{Zwitter ion}}{CH _{2}- COO ^{-}}$