First slide

Crystal field theory

Question

Based on spectrochemical series, the correct increasing order of field strength of ligands is

Difficult

A

$I^{-} < {SCN}^{-} < {Br}^{-} < {Cl}^{-}$
B

$F^{-} < H_{2} O < C_{2} O_{4}^{- 2} < {OH}^{-}$
C

${NCS}^{-} < {NH}_{3} < {edta}^{- 4} < en$
D

${NCS}^{-} < {NO}_{2}^{-} < {CN}^{-} < CO$

Solution

$I^{-} < {Br}^{-} < {SCN}^{-} < {Cl}^{-} < S^{- 2} < F^{-} < {OH}^{-} < C_{2} O_{4}^{- 2} < H_{2} O < {NCS}^{-} < {edta}^{- 4} < {NH}_{3} < en < {CN}^{-} < CO$ .

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