Which of the following complex will show largest splitting of...

Which of the following complex will show largest splitting of d-orbitals?

Options

A ${\left[Fe{\left({C}_{2}{O}_{4}\right)}_{3}\right]}^{3 -}$
B ${\left[{FeF}_{6}\right]}^{3 -}$
C ${\left[Fe ( CN{)}_{6}\right]}^{3 -}$
D ${\left[Fe{\left({NH}_{3}\right)}_{6}\right]}^{3 +}$

Correct answer

C. ${\left[Fe ( CN{)}_{6}\right]}^{3 -}$

Step-by-step solution

Some ligands are able to produce strong fields in which case, the splitting will be large whereas others produce weak fields and consequently result in a small splitting of d orbitals.

In general, ligands can be arranged in a series called spectrochemical series according to which maximum splitting is done by the strongest ligand which is cyanide ( ${CN}^{-}$ ) ion in this case.

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