The reactivity of the following compounds toward water is in the order:

  • A
    $Cl_2O_7 < P_2O_5 < B_2O_3$
  • B
    $B_2O_3 < P_2O_5 < Cl_2O_7$
  • C
    $P_2O_5 < B_2O_3 < Cl_2O_7$
  • D
    $B_2O_3 < Cl_2O_7 < P_2O_5$

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