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  4. Which is the strongest field ligand?

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Q. Which is the strongest field ligand?

Coordination Compounds

Solution:

$CN^{-}$ is the strongest field ligand. Thus spectrochemical series order is:
$I^{-} < Br < Cl^{-} < F^{-} < [C_{2}O_{4}]^{2-} < H_{2}O < py < NH_{3} < en < NO_{2} < CN^{-} < CO.$