Identify the major product $X$ formed in the following reaction:

Which of the following reactions does not produce benzaldehyde?

$R-CH=CH_2 + CO + H_2 \xrightarrow[\text{High Pressure}]{\text{High Temp}} R-CH_2CH_2CHO$. The above reaction is:

Which of the following reactions cannot be used to prepare benzaldehyde?

The reduction of benzoyl chloride with $Pd$ and $BaSO_4/CaCO_3$ produces :

The major product of the following chemical reaction is
$CH_{3}CH_{2}CN \xrightarrow[(3) Pd/BaSO_{4}, H_{2}]{(1) H_{3}O^{+}, \Delta \quad (2) SOCl_{2}} ?$