Which of the following is the correct order of increasing field strength of ligands to form coordination compounds ?
$S C N^{-} < F^{-} < C N^{-} < C_{2} O_{4}^{2 -}$
$F^{-} < S C N^{-} < C_{2} O_{4}^{2 -} < C N^{-}$
$S C N^{-} < F^{-} < C_{2} O_{4}^{-} < C N^{-}$
$C N^{-} < C_{2} O_{4}^{2 -} < S C N^{-} F^{-}$

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Solution

The correct option is C $S C N^{-} < F^{-} < C_{2} O_{4}^{-} < C N^{-}$
Ligands can be arranged in a series of increasing field strength known as spectrochemical series.

Spectrochemical series:
$I^{-} < B r^{-} < S C N^{-} < C l^{-} < S^{2 -} < F^{-} < - O H < C_{2} O_{4}^{2 -} < H_{2} O < N C S^{-} < E D T A^{4 -} < N H_{3} < e n < C N^{-} < C O$

Hence, option (d) is correct.

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