${CN}^{-}$ is a strong field ligand. This is due to the fact that

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It is a pseudohalide

It can accept electron from metal species

It forms high spin complexes with metal species

It carries negative charge

answer is D.

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Detailed Solution

Cyanide ion is strong field ligand because it is a pseudohalide ion, pseudohalide ions are stronger coordinating ligand & they have the ability to form a bond (from the pseudohalide to the metal) and $π$ bond (from the metal to pseudohalide).

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