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

B

Explanation

`d^(3) and d^(4)` systems have `e^(2)t_(2g)^(1) and e^(2)t_(2g)^(2)` (high spin state) configuration. In weak field are `e^(3)t_(2g)^(0) and e^(4)t_(2g)^(0)` (low spin state) configurations.