$CH_3-CO-CH_3 + [O] \xrightarrow{SeO_2} P + Se + H_2O$. What is $P$ here?

The major product formed in the following reaction is:

What is the reduction of aldehydes and ketones in the presence of zinc amalgam and concentrated $HCl$ called?

Match the Column-$I$ with Column-$II$.

Column-$I$	Column-$II$
$A$. Acetophenone and Benzophenone	$P$. $NaHCO_3$
$B$. Phenol and Benzoic acid	$Q$. $NaHSO_3$
$C$. Propanone and Ethanal	$R$. $I_2 / NaOH$
$D$. Acetone and Acetophenone	$S$. Fehling solution

In the following reaction:
$\text{Carbonyl compound} + MeOH \xleftarrow[HCl]{} \text{acetal}$
The rate of the reaction is the highest for:

$x$ is the product obtained from propanenitrile and stannous chloride in the presence of hydrochloric acid followed by hydrolysis. $y$ is the product obtained from but$-2-$ene by ozonolysis followed by hydrolysis. From the following, which product is not obtained when one mole of $x$ and one mole of $y$ react with each other in the presence of alkali followed by heating?