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Question: Answered & Verified by Expert
$\mathrm{CN}^{-}$is strong field ligand. This is due to the fact that :
ChemistryCoordination CompoundsNEETNEET 2004
Options:
  • A it carries negative charge
  • B it is a pseudohalide
  • C it can accept electrons from metal species
  • D it form high spin complexes with metal species
Solution:
1666 Upvotes Verified Answer
The correct answer is: it is a pseudohalide
Cyanide ion is strong field ligand because it is a pseudohalide ion. Pseudohalide ions are stronger coordinating ligand \& they have the ability to form $\sigma$ bond (from the pseudohalide to the metal) and $\pi$ bond (from the metal to pseudohalide).
Related Theory
A pseudohalide is an anion which has similar properties to a halogen, but not a real halogen. Pseudohalogens are polyatomic analogues of halogens, or also called 'fake' halogens, whose properties resemble that of true halogens.

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