Which of the following complex is octahedral, diamagnetic and the most stable?

Question

Canvas Classes · Accepted Answer

Strategy:
 Determine the geometry and magnetic behavior (unpaired electrons) for each complex. Thermodynamic stability usually correlates with strong field ligands like .

Step 1: Evaluate each option
- :  () with weak field  forms a high-spin octahedral complex (4 unpaired electrons)  Paramagnetic.
- :  () forms an octahedral complex with 2 unpaired electrons  Paramagnetic.
- :  () with strong field  forms a low-spin octahedral complex (). It has 0 unpaired electrons  Diamagnetic.  produces an

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