What are $X$ and $Y$ in the given reactions?
$2X_{2(g)} + 2H_2O_{(l)} \to 4H^{+}_{(aq)} + 4X^{-}_{(aq)} + O_{2(g)}$
$Y_{2(g)} + H_2O_{(l)} \to HY_{(aq)} + HOY_{(aq)}$

• A
  $X = Cl, Y = F$
• B
  $X = Cl, Y = Br$
• C
  $X = F, Y = Cl$
• D
  $X = I, Y = F$