The complex that has highest crystal field splitting energy (Δ), is:

Question

Canvas Classes · Accepted Answer

Strategy:
 Compare the structural parameters—specifically the ligand field strength from the spectrochemical series and the metal oxidation state—to find the highest crystal field splitting ().

Step 1: Evaluate each complex
- : Octahedral  with , which is at the extreme strong-field end of the spectrochemical series. Highest splitting expected.
- : Octahedral  with mixed . Moderate splitting.
- : Octahedral  mostly with . Moderate splitting.
- : Tetrahedral . Tetrahedral splitting () is inheren

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