Hydrogen And Its Compounds

What are \(X\) and \(Y\) respectively in the following reactions?

$$\begin{aligned} & \underline{X}+D_2 \mathrm{O} \longrightarrow C_2 D_2+P \\ & \underline{Y}+D_2 \mathrm{O} \longrightarrow C D_4+Q \end{aligned}$$