How many of the following compounds will undergo Cannizzaro reaction?

${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{CHO}, {\mathrm{H}}_3{\mathrm{CCH}}_2\mathrm{CH}\left({\mathrm{CH}}_3\right)\mathrm{CHO}, \mathrm{HCHO}$

${\left({\mathrm{CH}}_3\right)}_3\mathrm{CCHO},{\mathrm{CH}}_3\mathrm{CHO},{\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{CH}}_2\mathrm{CHO}$.

${\mathrm{P}}_2+{\mathrm{FeCl}}_3⟶\mathrm{Red} \mathrm{colour}$

${\mathrm{P}}_1+\mathrm{NaOI}⟶\underset{\mathrm{Yellow}}{{\mathrm{P}}_3\downarrow }+{\mathrm{P}}_4$

If $\mathrm{x}=$ Molecular mass of gas obtained when ${\mathrm{P}}_3$ is treated with $\mathrm{Ag}$ powder. $\mathrm{y}=$ Molecular mass of aromatic hydrocarbon obtained when ${\mathrm{P}}_4$ is treated with soda lime $/\mathrm{\Delta }$. Then value of $\left(\frac{\mathrm{y}}{\mathrm{x}}\right)$ is....