Two aldopentoses X and Y give the same osazone derivative. X is oxidized to an optically active aldaric acid by dilute nitric acid. Ruff degradation of Y gave a tetroe which was similarly oxidized to an optically active aldaric acid. Assign the structures of X and Y from the following list?

Options

A. X=1 and Y=4
B. X = 4 and Y=1
C. X=2 and Y=3
D. X=3 and Y=2

Answer

D

Explanation

The structures mentioned in option (d) have the same configuration at C-3, C-4 and C-5. Therefore they give the same osazone
This has no plane of symmetry and hence optically active