The complex with highest magnitude of crystal field splitting energy (Δ₀) is:

Question

Canvas Classes · Accepted Answer

Strategy:
 The crystal field splitting energy () depends on the nature of the ligands, the oxidation state of the metal, and the principal quantum number.

Step 1: Evaluate the complexes
All options involve the same weak field ligand () and a +3 oxidation state.
-  ()
-  ()
-  ()
-  ()

Step 2: Identify the maximum 
Across a period,  generally increases as nuclear charge increases, but the stable half-filled  configuration of  and the pairing effects in  lower their relative effective splitting.

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