Which of the following is the correct order of increasing field strength of ligands to form coordination compounds ?

F^{-} < S C N^{-} < C_{2} O_{4}^{2 -} < C N^{-}

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S C N^{-} < F^{-} < C_{2} O_{4}^{2 -} < C N^{-}

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S C N^{-} < F^{-} < C N^{-} < C_{2} O_{4}^{2 -}

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C N^{-} < C_{2} O_{4}^{2 -} < S C N^{-} < F^{-}

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Solution

The correct option is B $S C N^{-} < F^{-} < C_{2} O_{4}^{2 -} < C N^{-}$
Spectrochemical series is derived by the electron donor and acceptor abilities of ligands. Based on this the increasing field strength is $S C N^{-} < F^{-} < C_{2} O_{4}^{2 -} < C N^{-}$

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