Arrange the ligands $NH_3, en, Cl^-,$ and $CO$ in the increasing order of their field strength (spectrochemical series).

  • A
    $Cl^- < NH_3 < en < CO$
  • B
    $CN^- < NH_3 < CO < en$
  • C
    $en < CN^- < NH_3 < CO$
  • D
    $CO < NH_3 < en < Cl^-$

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