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  4. Two aldopentoses ' X' and ' Y' give the same osazone derivative. ' X' is oxidised to an optically active aldaric acid by dilute nitric acid. Ruff degradation of ' Y' gave a tetrose which was similarly oxidised to an optically active aldaric acid. Assign the structures of ' X' and ' Y ' from the following list. <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/chemistry/ab26cef2ad33bce7144dfeb21afdfddd-.png />

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Q. Two aldopentoses ' $X$' and ' $Y$' give the same osazone derivative. $' X$' is oxidised to an optically active aldaric acid by dilute nitric acid. Ruff degradation of ' $Y$' gave a tetrose which was similarly oxidised to an optically active aldaric acid.
Assign the structures of ' $X$' and ' $Y$ ' from the following list.
image

Biomolecules

Solution:

'$X$' and ' $Y$' have same osazone derivative, it means configuration at $C-3$ and $C-4$ is the same.

image