Carbon donor ligands are strong ligands and usually forms low spi… - Vidyadip

MCQ

Carbon donor ligands are strong ligands and usually forms low spin complexes. Among the complexes given below, select the high spin complex

A
$Fe(CN)_6]^{3-}$
B
$[Fe(CN)_6]^{4-}$
✓
$[Fe(C_2O_4)_3]^{3-}$
D
none of these

✓

Answer

Correct option: C.

$[Fe(C_2O_4)_3]^{3-}$

c
The complex among the given complexes which shows high spin is $\left[ Fe \left( C _{2} O _{4}\right)_{3}\right]^{3-} .$ This is because the $\left( C _{2} O _{4}\right)$ is a weak field sigma donar ligand
which do not pair up the electrons as CN ligand in the other complexes.

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