The product obtained in the reaction is:

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(A) The reaction of $D-(+)-Glyceraldehyde$ with $KCN$ followed by $H^+$ is a cyanohydrin formation reaction. This reaction creates a new chiral center

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$Diastereomer$

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(A) The reaction of $D-(+)-Glyceraldehyde$ with $KCN$ followed by $H^+$ is a cyanohydrin formation reaction. This reaction creates a new chiral center at the carbonyl carbon. Since the starting material $D-(+)-Glyceraldehyde$ is already chiral,the addition of the cyanide group can occur from either side of the planar carbonyl group. This results in the formation of two new stereoisomers that are not mirror images of each other,which are known as diastereomers.

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$A$ $D$-carbohydrate is:

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