In Hunsdiecker reaction,

An optically active compound $\left(\mathrm{X}\right)$ has molecular formula ${\mathrm{C}}_4{\mathrm{H}}_8{\mathrm{O}}_3$. It evolves ${\mathrm{CO}}_2$ with ${\mathrm{NaHCO}}_3$. $\left(\mathrm{X}\right)$ reacts with ${\mathrm{LiAlH}}_4$ to give an achiral compound. Structure of $\left(\mathrm{X}\right)$ is:

Product $\left(\mathrm{Q}\right)$ of the reaction is

Identify the final product in the following sequence of reaction.

Identify the final product in the following sequence of reaction.

Identify product $\left(\mathrm{Z}\right)$ in following sequence of reaction

${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{Br} \stackrel{\mathrm{NaCN}}{\to }\left(\mathrm{X}\right)\stackrel{{\mathrm{H}}_3{\mathrm{O}}^{\oplus }}{\to }\left(\mathrm{Y}\right)\underset{{\mathrm{H}}^{\oplus }}{\overset{{\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}}{\to }}\left(\mathrm{Z}\right)$