Which one of the following ligand has the highest field strength?

C N^{-}

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N O_{2}^{-}

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N H_{3}

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Ethylenediamine

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Solution

The correct option is A $C N^{-}$
Ligands can be arranged in a series of increasing field strength known as spectrochemical series.

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

Hence, $C N^{-}$ is the strong field ligand.

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