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  4. In aqueous solution, amino acids mostly exit as

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Q. In aqueous solution, amino acids mostly exit as

BITSATBITSAT 2007

Solution:

In aqueous solutions, amino acids mostly exist as $H _{3} \overset{+}{N}- CHRCOO ^{-}$(zwitter ion).
In aqueous solution, amino acids exist in two forms. A very small fraction of amino acid molecules will be neutral, with a deprotonated amino groum and a protonated carboxylic acid group. However, the overwhelming majority of molecules will be in a zwitterion tautomer, with a positive charge on the protonated amino group and a negative charge on the deprotonated carboxylate group.