`CN^(-)` is a strong field ligand. This is due to the fact that

Options

A. it carries negative charge
B. it is pseudo-halide
C. it can accept electrons from metal species
D. it forms high spin complexes with metal species.

Answer

B

Explanation

Cyanide ion is strong field ligand because it is a pseudohalide. Psudohalide ions are stronger coordination ligands and they have the ability to forms `sigma`-bond (from the pseudohalide to the metal) and `pi` -bond (from the metal to pseudo-halide).