$Y$ in the given sequence of reactions is
$P_4 + x NaOH + y H_2O \xrightarrow{CO_2} X + z NaH_2PO_2$
$X + CuSO_4 \rightarrow Y + H_2SO_4$

  • A
    $Cu_3(PO_4)_2$
  • B
    $Cu_3P_2$
  • C
    $CuH_2PO_2$
  • D
    $Cu_2(PO_3)_2$

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