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

$ X \stackrel{\mathrm{CO}}{\longleftarrow} \mathrm{~B}_{2} \mathrm{H}_{6} \xrightarrow[\left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{2} \mathrm{O}]{\mathrm{NaH}} Y $

Which of the following statements are correct?

(i) $\mathrm{CCl}_{4}$ undergoes hydrolysis easily

(ii) Diamond has directional covalent bonds

(iii) Fullerene is thermodynamically most stable allotrope of carbon

(iv) Glass is a man-made silicate

The correct answer is

Observe the following reactions (unbalanced)

$ \begin{array}{r} \mathrm{P}_{2} \mathrm{O}_{3}+\mathrm{H}_{2} \mathrm{O} \longrightarrow X \\ \mathrm{P}_{4} \mathrm{O}_{10}+\mathrm{H}_{2} \mathrm{O} \longrightarrow Y \end{array} $

The number of $\mathrm{P}=\mathrm{O}$ bonds present in $X, Y$ are respectively