Which of the following statements is not correct?

Options

A. Weak ligands like `F^(-),Cl^(-)` form high-spin complexes
B. Strong ligands like CN form low-spin complexes
C. `[FeF_6]^(3-)` is a high-spin complex .
D. `Ni(CO)_4` is a high-spin complex

Answer

D

Explanation

`F^(-)` and `Cl^(-)` are weak ligands. These have small tendency of pairing metal electrons. Thus, these form · high-spin complexes. The spacing of splitted orbitals of metal ions is small.
`CN^(-)` is a strong ligand. It has high tendency of pairing metal electrons. Thus, it formslow-spin complexes. CO is a strong ligand and thus it forms low-spin complexes.