(C) chiral centre is a carbon atom bonded to four different groups. In $Glycine$ $(NH_2-CH_2-COOH)$,the $\alpha$-carbon is bonded to two hydrogen atom

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(C) chiral centre is a carbon atom bonded to four different groups. In $Glycine$ $(NH_2-CH_2-COOH)$,the $\alpha$-carbon is bonded to two hydrogen atoms,which are identical. Therefore,$Glycine$ is the only achiral amino acid among the proteinogenic amino acids.