$A + H_2O \to B + HCl$ and $B + 3H_2O \to C + 3HCl$. Compounds $(A)$,$(B)$,and $(C)$ are respectively:

  • A
    $PCl_5, POCl_3, H_3PO_3$
  • B
    $PCl_5, POCl_3, H_3PO_4$
  • C
    $SOCl_2, POCl_3, H_3PO_3$
  • D
    $PCl_3, POCl_3, H_3PO_4$

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