What are X and Y respectively in the following reaction ?

$\mathrm{X}\stackrel{{\mathrm{PBr}}_3}{⟶}{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Br}\stackrel{\mathrm{AgOH}\left(\mathrm{Aq}\right)}{⟶}\mathrm{Y}$

$\underset{\mathrm{X}}{{\mathrm{C}}_2}{\mathrm{H}}_5\mathrm{OH} \stackrel{{\mathrm{PBr}}_3}{⟶} {\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Br} \stackrel{\mathrm{AgOH}\left(\mathrm{Aq}\right)}{⟶} \underset{\mathrm{Y}}{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}}$

In the given reaction, ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}$ reacts with ${\mathrm{PBr}}_3$ to give ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Br}$. Then ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Br}$ reacts with $\mathrm{AgOH}\left(\mathrm{Aq}\right)$ to give ${\text{C}}_2{\mathrm{H}}_5\mathrm{OH}$ as the product.

Hence, X and Y in the reaction is ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}$ and ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}$ respectively.