Question

Among the following statements about the molecules $X$ and $Y$, the one (s) which is (are) correct is (are)

• A. X and Y are diastereomers
• B. X and Y are enantiomers
• C. X and Y are both aldohexoses
• D. X is a D-sugar and Y is an L-sugar

Answer 1

Answer: (D)

X is a D-sugar and Y is an L-sugar

Answer 2

Both the given molecules contain $6$ carbon atoms with an aldehyde group, so these are called aldohexoses.

In $X$, the $- OH$ attached to second last carbon in on right hand side while in $Y$ it is on left hand side, so $X$ is $D$ -sugar and $Y$ is $L$-sugar.

$X$ and $Y$ are the mirror images of each other, i.e., these are enantiomers.