First slide

Crystal field theory

Question

Which is the strongest field ligand?

Moderate

A

${NO}_{2}^{-}$
B

${CN}^{-}$
C

${NH}_{3}$
D

en

Solution

${CN}^{-}$ is the strongest field ligand. Thus spectrochemical series order is:
$I^{-} < {Br}^{-} < {Cl}^{-} < F^{-} < {[C_{2} O_{4}]}^{2 -} < H_{2} O < py < {NH}_{3} < en < {NO}_{2}^{-} < {CN}^{-} < CO$

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