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.

Question

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" /> (A) X= I , Y= IV (B) X= IV , Y= I (C) X= III , Y= II (D) X= II , Y= III

Tardigrade Admin · Accepted Answer

'X' and ' Y' have same osazone derivative, it means configuration at C-3 and C-4 is the same. <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/chemistry/e4f3f45aa63f13027149683f19f63ae7-.png" />

$X = I, Y = I V$

$X = I V, Y = I$

$X = III, Y = II$

$X = II, Y = III$

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

X=I,Y=IV

X=IV,Y=I

X=III,Y=II

X=II,Y=III

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

$X = I, Y = I V$

$X = I V, Y = I$

$X = III, Y = II$

$X = II, Y = III$

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