On heating a mixture of calcium acetate and calcium formate,the product formed is:

The reaction of benzene with $CO$ and $HCl$ in the presence of anhydrous $AlCl_3$ gives a compound $X$. $X$ can also be obtained from which of the following reactions?

Nitriles are reduced to corresponding imine with stannous chloride in the presence of hydrochloric acid,which on hydrolysis gives the corresponding aldehyde. This reaction is called:

$CH_3-CO-CH_2-COOH \xrightarrow{\Delta} X$; $X$ can also be formed by

In the following reaction,product $P$ is: $RCOCl \xrightarrow{H_2, Pd-BaSO_4} P$

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