STANDARD Chemistry Crystal Field Theory MCQ Question
The magnitude of CFSE (crystal field splitting energy, Δ₀) can be related to the configuration of d-orbitals in a coordination entity as
if Δ₀ < P, the configuration is t₂g³e₉¹ = weak field ligand and high spin complex
if Δ₀ > P, the configuration is t₂g⁶e₉⁰ = strong field ligand and low spin complex
if Δ₀ > P, the configuration is t₂g⁴e₉² = strong field ligand and high spin complex
if Δ₀ = P, the configuration is t₂g⁴e₉⁰ strong field ligand and high spin complex.
Correct Answer
Detailed Explanation
If CFSE (Δ₀) < P (Energy required for pairing), the electrons do not pair up and the fourth electron goes to e₉ of higher energy. Hence, a high spin complex is formed. Pairing of electrons does not take place in case of weak field ligands.
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