\(\xrightarrow{{\Delta ,\,{H^ + }}}\,\mathop {C{H_3}COC{H_2}COOH}\limits_{(Y)} \)
$[A]\,\,\begin{array}{*{20}{c}} {C{H_3} - C - {O^ - }} \\ {\,\,||} \\ {\,\,O} \end{array}$
$[B]\,\,CH_3O^-$
$[C]\,\,CN^-$
$[D]\,\,$
નીપજ $A$ શું હશે ?