Which of the following reactions gives diaste | vedclass

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(D) Diastereomers are stereoisomers that are not mirror images of each other. $(1)$ Oxidation of erythrose with $HNO_3$ gives erythraric acid,which is

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(D) Diastereomers are stereoisomers that are not mirror images of each other. $(1)$ Oxidation of erythrose with $HNO_3$ gives erythraric acid,which is a single product (meso compound). $(2)$ Oxidation of glucose with $Br_2/H_2O$ gives gluconic acid,which is a single product. $(3)$ Addition of $HCN$ to acetaldehyde creates a new chiral center,resulting in a racemic mixture of enantiomers. $(4)$ In the reaction of $2$-deuteropropanal with $NaCN/H^+$,a new chiral center is formed at the carbonyl carbon. Since the starting material ($2$-deuteropropanal) already contains a chiral center,the addition of the cyanide group creates two new stereoisomers. These two products have the same configuration at the original chiral center but opposite configurations at the newly formed chiral center,making them diastereomers.

Which of the following reactions gives diastereomers?

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