Which of the following pairs of d-electron configuration exhibit both low and high spin tetrahedral complex

Options

A. `d^(1), d^(2)`
B. `d^(3), d^(4)`
C. `d^(7), d^(8)`
D. `d^(9), d^(10)`

Answer

2

Explanation

`d^(3)` and `d^(4)` system have `e_(g)^(2)t_(2g)^(1)` and `e_(g)^(2)t_(2g)^(2)` (high spin state configuration). `e_(g)^(3)t_(2g)^(0)` and `e_(g)^(4)t_(2g)^(0)` (low spin state configurations)