$C{{H}_{3}}CN+2H\underset{\text{Ether}}{\mathop{\xrightarrow{HCl}}}\,X\underset{{{H}_{2}}O}{\mathop{\xrightarrow{\text{Boiling}}}}\,Y;$ the term $Y$ is:

The product $B$ is

$CH_2(CO_2 Et)_2 $ $\xrightarrow[Et-I]{EtO^{\circleddash}} \,\,\xrightarrow[Et-I]{EtO^{\circleddash}}
\,\,\overset{Urea}{\rightarrow} $ $(P)$

