The most suitable reagent for the conversion of $R-CH_2-OH \rightarrow R-CHO$ is:

Identify the product '$Y$' in the following reaction: $\text{Benzonitrile} \xrightarrow{C_6H_5MgBr/\text{dry ether}} X \xrightarrow{H_3O^+} Y + MgBr(OH) + NH_3$

The main reactants involved in the Etard reaction are:

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

Identify $A, B$ and $C$ in the following reaction:
$\text{Toluene} + A + B$ $\xrightarrow{273-283 \ K} C$ $\xrightarrow{H_3O^{\oplus}} \text{Benzaldehyde}$

Match List-$I$ with List-$II$.

$A$. $C_6H_5COCl + H_2 \xrightarrow{Pd-BaSO_4} C_6H_5CHO$	$I$. Gattermann-Koch reaction
$B$. $CH_3CN + SnCl_2 + HCl \rightarrow CH_3CHO$	$II$. Etard reaction
$C$. $C_6H_5CH_3 + CrO_2Cl_2 \rightarrow C_6H_5CHO$	$III$. Stephen reaction
$D$. $C_6H_6 + CO + HCl \xrightarrow{AlCl_3} C_6H_5CHO$	$IV$. Rosenmund reaction

Choose the correct answer from the options given below.