In the following reaction
$\mathrm{Aldehyde}+\mathrm{Alcohol}\stackrel{\mathrm{HCl}}{\to }\mathrm{Acetal}$

$\mathrm{A}\mathrm{l}\mathrm{d}\mathrm{e}\mathrm{h}\mathrm{y}\mathrm{d}\mathrm{e}\mathrm{ }\mathrm{}$	$\mathrm{A}\mathrm{l}\mathrm{c}\mathrm{o}\mathrm{h}\mathrm{o}\mathrm{l}$
$\mathrm{HCHO}$	$\mathrm{t}-\mathrm{BuOH}$
${\mathrm{CH}}_3\mathrm{CHO}$	$\mathrm{ }\mathrm{MeOH}$

The best combination is:

$\begin{array}{ccc}{\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{OH},& {\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{CHO},& {\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{COOH}\\ \left(1\right)& \left(2\right)& \left(3\right)\end{array}$

$\mathrm{X}\underset{\mathrm{ehter}}{\overset{\mathrm{Mg}}{\to }}\mathrm{Y}\underset{{\mathrm{H}}^{+}}{\overset{\mathrm{Dry} {\mathrm{CO}}_2}{\to }}\mathrm{Z}\stackrel{\mathrm{hot} {\mathrm{KMnO}}_4}{\to }\mathrm{P}$

The two isomeric compounds which will give the same tricarboxylic acid after the above sequence of reactions are

Which of the following will be product of following reaction?