What are $X$ and $Y$ respectively in the following sets of reactions?

A carbonyl compound $X\left(\mathrm{C}_8 \mathrm{H}_8 \mathrm{O}\right)$ undergoes disproportionation with conc. KOH on heating. Product of $X$ with $\mathrm{Zn}-\mathrm{Hg} / \mathrm{HCl}$ is $Y$ and product of $X$ with $\mathrm{NaBH}_4$ is Z . What are $Y$ and Z respectively?

What is the major product $Y$ in the following reaction sequence?

Arrange the following in decreasing order of electrophilicity of carbonyl carbon.

$$ \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CHO} $$