The structure of glycine (amino acid) is
(zwitterion). Select the correct statement of the following

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Glycine, as well as other amino acids are amphoteric

The acidic functional group in amino acids is $\overset{+}{N} H_{3}$

The basic functional group in amino acids is $- {CO}_{2}^{-}$

All the statements are correct

answer is D.

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Detailed Solution

Glycine and all other amino acids are amphoteric because of the presence of NH₂ and CO₂H group. The amino acid exists as a zwitterion and the acidic group is $\overset{+}{N} H_{3}$ while the basic group is $- {CO}_{2}^{-}$ .

Hence, the correct answer is (4).

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