For which of the following d^n configurations | vedclass

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(B) In octahedral complexes,the $d$-orbitals split into $t_{2g}$ and $e_g$ sets.For $d^1, d^2, d^3$ configurations,electrons fill the $t_{2g}$ orbital

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$I$ & $IV$

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(B) In octahedral complexes,the $d$-orbitals split into $t_{2g}$ and $e_g$ sets.For $d^1, d^2, d^3$ configurations,electrons fill the $t_{2g}$ orbitals first,and there is no ambiguity regarding high or low spin.For $d^4, d^5, d^6, d^7$ configurations,electrons can either pair up in $t_{2g}$ (low spin) or occupy $e_g$ (high spin) depending on the field strength of the ligand.For $d^8, d^9, d^{10}$ configurations,the filling pattern is fixed by Hund's rule and the Pauli exclusion principle,resulting in only one possible spin state.Therefore,$d^3$ and $d^8$ configurations do not exhibit high spin and low spin forms.

For which of the following $d^n$ configurations of octahedral complexes,can they $NOT$ exist in both high spin and low spin forms?
$(I)$ $d^3$,$(II)$ $d^5$,$(III)$ $d^6$,$(IV)$ $d^8$

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For which of the following $d^n$ configurations of octahedral complexes,can they $NOT$ exist in both high spin and low spin forms?$(I)$ $d^3$,$(II)$ $d^5$,$(III)$ $d^6$,$(IV)$ $d^8$