Which of the following compounds is obtained by dry distillation of calcium propionate?

The structure of $PCC$ is

$L$ $\xrightarrow[(ii) H_3O^{\oplus}]{(i) PhMgBr} M$ $\xrightarrow{CrO_3 / H^{\oplus}} N$ $\xrightarrow{Ph_3P=CH_2} Ph_2C=CH_2$
$L$ in the above sequence of reaction is/are (where $L \neq M \neq N$)

Product $A$ in the reaction will be:

The reagents/chemicals $X$ and $Y$ that convert cyanobenzene to a Schiff's base are:

Acetophenone cannot be prepared easily starting from