Which L-sugar on oxidation with HNO_3 gives a | vedclass

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(A) Oxidation of an aldose with $HNO_3$ converts both the terminal $-CHO$ and $-CH_2OH$ groups into $-COOH$ groups,resulting in a dicarboxylic acid (a

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(A) Oxidation of an aldose with $HNO_3$ converts both the terminal $-CHO$ and $-CH_2OH$ groups into $-COOH$ groups,resulting in a dicarboxylic acid (aldaric acid).For the resulting acid to be optically active,it must lack a plane of symmetry (i.e.,it should not be a meso compound).Structure $(a)$ is $L$-gulose. Upon oxidation,it forms $L$-gularic acid,which is optically active.Structure $(d)$ is $L$-galactose. Upon oxidation,it forms mucic acid (galactaric acid),which is a meso compound (optically inactive due to an internal plane of symmetry).Therefore,the $L$-sugar that yields an optically active dibasic acid is $(a)$.

Which $L$-sugar on oxidation with $HNO_3$ gives an optically active dibasic acid ($2$ $COOH$ groups)?

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