Which of the following reactions uses sodium cyanide $(NaCN)$ as a catalyst?

Identify the name of the reaction in which the carbonyl group of aldehydes and ketones is reduced to a methylene group upon treatment with hydrazine,followed by heating with sodium hydroxide in ethylene glycol.

The reaction of acetophenone with benzaldehyde in the presence of $HCl$ and heat produces product $(A)$. Identify $(A)$.

The product $(A)$ of the following reaction is:

The above conversion can be achieved by:

In the Cannizzaro reaction given below,the slowest step is $:-$
$2Ph-CHO \xrightarrow{\stackrel{\ominus}{O}H} PhCH_2OH + PhCO_2^{\ominus}$