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(A) Highly electropositive metals (like $Mg$) react with Boron $(B)$ to form magnesium boride $(Mg_3B_2)$ and with Silicon $(Si)$ to form magnesium si

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$B, Si$

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(A) Highly electropositive metals (like $Mg$) react with Boron $(B)$ to form magnesium boride $(Mg_3B_2)$ and with Silicon $(Si)$ to form magnesium silicide $(Mg_2Si)$.Hydrolysis of $Mg_3B_2$ yields borane $(B_2H_6)$:$Mg_3B_2 + 6H_2O \rightarrow 3Mg(OH)_2 + B_2H_6$Hydrolysis of $Mg_2Si$ yields silane $(SiH_4)$:$Mg_2Si + 4H_2O \rightarrow 2Mg(OH)_2 + SiH_4$Therefore,$X$ is $B$ and $Y$ is $Si$.

Two elements $X$ and $Y$ react with highly electropositive metals to form binary compounds,which upon hydrolysis yield borane and silane,respectively. What are $X$ and $Y$?

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