Catalyst used in Rosenmund reduction is

$C_6H_5CH_3$ $\xrightarrow{CrO_2Cl_2} A$ $\xrightarrow{H_2O} B$
The functional group present in $B$ and the name of the reaction are:

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

What are $X$ and $Y$ in the following reactions?

Reduction of acetyl chloride with $H_2$ in the presence of $Pd$ gives:

Identify the compound $C$ in the following sequence:
$(CH_3)_2CHCH_2C \equiv N$ $\xrightarrow{HCl, H_2O} \text{compound } A$ $\xrightarrow[2. H_2O]{1. LiAlH_4} \text{compound } B$ $\xrightarrow{PCC, CH_2Cl_2} \text{compound } C$