For which of the following `d^(n)` configuration of octahedral complex(es), cannot exist in both high spin and low spin forms?

Options

A. `d^(3)`
B. `d^(5)`
C. `d^(6)`
D. `d^(8)`

Answer

B, D

Explanation

For `d^(3)` configuration :
In strong ligand field : `t_(2g)^(3)eg^(0)` , In weak ligand field : `t_(2g)^(3)eg^(0)`
* For `d^(8)` configuration :
In strong ligand field : `t_(2g)^(6)eg^(2)` , In weak ligand field , `t_(2g)^(6)eg^(2)`