Compound \(Y\) must give iodoform test. Further since \(Y\) is obtained by the oxidation of \(X\) which must be an alcohol \((CH_3CH_2OH)\) and thus \(Y\) is \(CH_3CHO\)
$\begin{array}{*{20}{c}}
{C{H_3}\,\,\,} \\
{|\,\,\,\,\,\,\,\,} \\
{C{H_3} - C - CHC{H_3}} \\
{\,|\,\,\,\,\,\,\,\,\,\,|} \\
{\,\,H\,\,\,\,\,\,\,Br}
\end{array}$ $\xrightarrow{{C{H_3}OH}}$