The correct sequence of ligands in the order of decreasing field strength is:

  • A
    $CO > H_2O > F^{-} > S^{2-}$
  • B
    $OH^{-} > F^{-} > NH_3 > CN^{-}$
  • C
    $NCS^{-} > EDTA^{4-} > CN^{-} > CO$
  • D
    $S^{2-} > OH^{-} > EDTA^{4-} > CO$

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