MCQ
For an octahedral complex, which of the following $d-$ electronic configuration will give maximum magnitude of crystal field stabilisation energy, in terms of ${\Delta _0}$
- ✓Low spin $d^5$
- BLow spin $d^4$
- CHigh spin $d^7$
- DHigh spin $d^6$
✓
Answer
Correct option: A.
Low spin $d^5$
a
Low spin $d^{5}$ electronic configuration corresponds to $t_{2 g}^{5} e_{g}^{0}$
Its CFSE is $5\left(-0.4 \Delta_{o}\right)+0\left(0.6 \Delta_{o}\right)=-2.0 \Delta_{o}$
Thus maximum value of CFSE will be for Low spind 5 electron configuration.
Low spin $d^{5}$ electronic configuration corresponds to $t_{2 g}^{5} e_{g}^{0}$
Its CFSE is $5\left(-0.4 \Delta_{o}\right)+0\left(0.6 \Delta_{o}\right)=-2.0 \Delta_{o}$
Thus maximum value of CFSE will be for Low spind 5 electron configuration.
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