Crystal field splitting energy for high spin \(d^4\) octahedral complex is

A \(- 1.2 \Delta _o\)
B \(- 0.6 \Delta _o\)
C \(- 0.8 \Delta _o\)
D \(- 1.6 \Delta _o\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(- 0.6 \Delta _o\)

Step-by-step Solution

Detailed explanation

in the case of high spin complex \(\Delta_{0}\) is small. Thus, the energy required to pair up the fourth electron with the electrons of lower energy \(d-\)orbitals would be higher than that required to place the electrons in the higher \(d-\)orbital. Thus pairing does not occur. For high spin \(d^4\) octahedral complex,

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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