The increasing order of field strength of ligands is:

  • A
    $Cl^{-} < H_2O < NH_3 < CO < CN^{-}$
  • B
    $Cl^{-} < H_2O < NH_3 < CN^{-} < CO$
  • C
    $Cl^{-} < CO < CN^{-} < H_2O < NH_3$
  • D
    $CN^{-} < CO < NH_3 < Cl^{-} < H_2O$

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