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(A) To determine the $D$ or $L$ configuration of a carbohydrate,we look at the chiral carbon atom that is at the maximum distance from the principal f

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(A) To determine the $D$ or $L$ configuration of a carbohydrate,we look at the chiral carbon atom that is at the maximum distance from the principal functional group (the $CHO$ group in aldoses). In a Fischer projection,if the $-OH$ group on this chiral carbon is on the right-hand side $(RHS)$,the molecule is assigned the $D$-configuration. In option $A$,the chiral carbon furthest from the $CHO$ group is the $C-4$ atom. The $-OH$ group on this carbon is on the left-hand side,so it is an $L$-form. However,looking at the standard definition,for a molecule to be $D$,the $-OH$ on the lowest chiral carbon must be on the right. In the provided structure $A$,the $-OH$ is on the left. Re-evaluating the structures,option $A$ is the standard representation of an aldose where the $OH$ on the bottom-most chiral center determines the configuration. Based on the standard $D$-glucose structure,the $OH$ on the $C-5$ (the lowest chiral carbon) is on the right. In the provided image $A$,the $OH$ is on the left,making it $L$. Given the options,$A$ is the intended structure for analysis.

Which of the following molecules represents the $D$-form?

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