The d-orbital electronic configuration of the complex among , , and that has the highest CFSE is:

Question

The d-orbital electronic configuration of the complex among , ,  and  that has the highest CFSE is:

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Strategy:
 To find the highest Crystal Field Stabilization Energy (CFSE), consider configurations maximizing electrons in lower orbitals () while minimizing anti-stabilizing upper orbitals (), guided by the field strength.

Step 1: Evaluate  occupancy and CFSE
- :  () with strong field  Low spin .
  CFSE = . This is the theoretical maximum CFSE for octahedral 3d metals.
- :  () weak field  High spin .
  CFSE = .
- :  () weak field  High spin .
  CFSE = .
- :  () .
  CFSE = .

The configuration y

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