Primary aldehyde on oxidation gives

Benzaldehyde on heating with concentrated $NaOH$ gives:

The polymer shown in the image is obtained when a carbon compound is allowed to stand. It is a white solid. The polymer is:

$C_2H_5CHO$ and $(CH_3)_2CO$ can be distinguished by testing with

$A$ carbonyl compound $X$ $(C_3H_6O)$ on oxidation gives a carboxylic acid $Y$ $(C_3H_6O_2)$. The oxime of $X$ is:

Compounds $P$ and $R$ upon ozonolysis produce $Q$ and $S$,respectively. The molecular formula of $Q$ and $S$ is $C_8H_8O$. $Q$ undergoes Cannizzaro reaction but not haloform reaction,whereas $S$ undergoes haloform reaction but not Cannizzaro reaction.
$(i)$ $P \xrightarrow[\text{ii) } Zn / H_2O]{\text{i) } O_3 / CH_2Cl_2} \underset{(C_8H_8O)}{Q}$
$(ii)$ $R \xrightarrow[\text{ii) } Zn / H_2O]{\text{i) } O_3 / CH_2Cl_2} \underset{(C_8H_8O)}{S}$
The option$(s)$ with a suitable combination of $P$ and $R$,respectively,is(are):