For osazone formation, the effective structural unit necessary is

MCQ

A
$\begin{array}{*{20}{c}}
{C{H_2}OC{H_3}}\\
{\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\
{CO\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\
{\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}$
✓
$\begin{array}{*{20}{c}}
{C{H_2}OH}\\
{\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\
{CO\,\,\,\,\,\,\,\,\,\,\,}\\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}$
C
$\begin{array}{*{20}{c}}
{C{H_2}OH}\\
{\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\
{CHOC{H_3}}\\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}$
D
$\begin{array}{*{20}{c}}
{CHO\,\,\,\,\,\,\,\,}\\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\
{CHOC{H_3}}\\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}$

✓

Answer

Correct option: B.

$\begin{array}{*{20}{c}}
{C{H_2}OH}\\
{\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\
{CO\,\,\,\,\,\,\,\,\,\,\,}\\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}$

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