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NEET levelSingle correct optionDifficulty 1 of 3cc009

Which of the following ligands is the strongest field ligand (largest $Δ_{o}$ )?

A $F X^{-}$
B $H X_{2} O$
C $CN X^{-}$
D $I X^{-}$

Answer: C

In the spectrochemical series

I X^{-} < F X^{-} < H X_{2} O < CN X^{-}

, cyanide is strongest because it is a strong sigma donor and pi acceptor.

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