MCQ
Which shows polymorphism
- A$O$
- B$S$
- C$Se$
- ✓All the above
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$C{H_3}CHO\mathop {\xrightarrow{{(i)\,NaCN/HCl}}}\limits_{(ii)\,{H_2}O/{H^ \oplus }/\Delta } (A)\mathop {\xrightarrow{{Fenton}}}\limits_{reagent} (B)$
$(B)$ will be :

$\begin{array}{*{20}{c}}
{{\,\,R_1}} \\
| \\
{R - C - X} \\
| \\
{{\,\,R_2}}
\end{array}\xrightarrow{{HOH}}\begin{array}{*{20}{c}}
{{\,\,R_1}\,\,\,\,} \\
{|\,\,\,\,} \\
{R - C - OH} \\
{|\,\,\,\,\,} \\
{{\,\,R_2}\,\,\,\,}
\end{array}$
Which substrate will give maximum racemisation ?