Question
Do amino acids exist as Zwitter ion. Give its structure. Why is it formed?

Answer

Yes, amino acids exist as Zwitter ion.

Image
Zwitter ion formation is another particular property of amino acid. It is a neutral molecule $($with positive and negative charge$),$ having the ionisable nature of
$-- NH_2$ and $-- COOH$ groups. Hence, in solutions of different $pHs$, the structure of amino acid changes variably.

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