\(\mathop {{C_2}{H_5}OH + C{l_2}}\limits_{(Z)} \xrightarrow{{Ca{{(OH)}_2}}}\mathop {C{H_3}CHO}\limits_{{\text{Acetaldehyde}}} \xrightarrow{{C{l_2}}}\)
\(\mathop {CC{l_3}CHO}\limits_{{\text{Chloral}}} \xrightarrow{{Ca{{(OH)}_2}}}\mathop {\mathop {CHC{l_3}}\limits_{{\text{chloroform}}} }\limits_{(Y)} \)
$C{H_2} = C{H_2}\, \xrightarrow{{HOCl}} \,A\xrightarrow{{_R}}\begin{array}{*{20}{c}}
{C{H_2}OH} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{C{H_2}OH}
\end{array}$