(D) An amino acid is optically active if it contains a chiral carbon atom (an asymmetric carbon bonded to four different groups). In glycine $(NH_2-CH

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(D) An amino acid is optically active if it contains a chiral carbon atom (an asymmetric carbon bonded to four different groups). In glycine $(NH_2-CH_2-COOH)$,the central carbon atom is bonded to two hydrogen atoms. Since two groups attached to the central carbon are identical,it is achiral and therefore not optically active.