The correct order of , , and complexes based on the number of unpaired electrons present is:

Question

The correct order of , ,  and  complexes based on the number of unpaired electrons present is:

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Strategy:
 Identify the oxidation state and d-electron configuration of the central metal in each complex. Use the spectrochemical series to assign high or low spin, then count the unpaired electrons.

Step 1: Evaluate each complex
- :  ().  is a weak field ligand  High-spin . Has 5 unpaired electrons.
- :  ().  is a weak field ligand  High-spin . Has 4 unpaired electrons.
- :  ().  is a strong field ligand  Square planar ()  All 8 electrons paired. Has 0 unpaired electrons.
- :  ().  is a stron

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