D-(+)-text{Glyceraldehyde} xrightarrow[(ii) H | vedclass

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(B) The reaction of $D-(+)-	ext{Glyceraldehyde}$ with $HCN$ followed by hydrolysis and oxidation with $HNO_3$ is a Kiliani-Fischer synthesis sequence

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One optically active and one meso product

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(B) The reaction of $D-(+)-	ext{Glyceraldehyde}$ with $HCN$ followed by hydrolysis and oxidation with $HNO_3$ is a Kiliani-Fischer synthesis sequence.$1$. The addition of $HCN$ to the aldehyde group of $D-(+)-	ext{Glyceraldehyde}$ creates a new chiral center,resulting in two diastereomeric cyanohydrins.$2$. Hydrolysis of these cyanohydrins converts the $-CN$ group into a $-COOH$ group,forming two diastereomeric aldonic acids.$3$. Oxidation with $HNO_3$ further oxidizes the terminal $-CH_2OH$ group to a $-COOH$ group,resulting in two dicarboxylic acids (aldaric acids).$4$. One of the resulting products is $meso-	ext{tartaric acid}$ (or a derivative),which is optically inactive due to an internal plane of symmetry.$5$. The other product is an optically active isomer (e.g.,$L-(+)-	ext{tartaric acid}$ derivative).Thus,the final products are one optically inactive $(meso)$ product and one optically active product.

$D-(+)-\text{Glyceraldehyde} \xrightarrow[(ii) H_2O/H^{+}]{(i) HCN, (iii) HNO_3}$
The products formed in the above reaction are

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$D-(+)-\text{Glyceraldehyde} \xrightarrow[(ii) H_2O/H^{+}]{(i) HCN, (iii) HNO_3}$The products formed in the above reaction are