$A$ compound $X$ upon reaction with $H_{2}O$ produces a colorless gas $Y$ with a rotten fish smell. Gas $Y$ is absorbed in a solution of $CuSO_{4}$ to give $Cu_{3}P_{2}$ as one of the products. Predict the compound $X$.

  • A
    $Ca_{3}P_{2}$
  • B
    $NH_{4}Cl$
  • C
    $As_{2}O_{3}$
  • D
    $Ca_{3}(PO_{4})_{2}$

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