Question

Which ligand among the following has the highest splitting power of d-orbitals of central metal ion?

• A. S\(^{2-}\)
• B. OH\(^{-}\)
• C. NCS
• D. CO

Hint:

When considering ligand field theory, remember that strong field ligands like CO cause a large splitting of d-orbitals, while weak field ligands like OH\(^{-}\) cause a smaller splitting.

Answer 1

The Correct Option is D

Step 1: Understanding ligand field theory.
Ligand field theory explains how ligands influence the splitting of d-orbitals in a metal complex. Ligands that produce a strong field cause a large splitting of the d-orbitals.
Step 2: Analyzing the options.
(A) S\(^{2-}\): Sulfide anion is a strong field ligand, but not the strongest compared to CO.
(B) OH\(^{-}\): Hydroxide is a weak field ligand, causing smaller splitting of d-orbitals.
(C) NCS: Thiocyanate is also a weak to moderate field ligand, causing intermediate splitting.
(D) CO: Carbon monoxide is a very strong field ligand and causes the maximum splitting of d-orbitals in a metal complex. It is known for its high splitting power.
Step 3: Conclusion.
The correct answer is (D) CO, as it has the highest splitting power due to its strong field strength.