The d-electron configurations of `Cr^(2+), Mn^(2+), Fe^(2+)` and `Co^(2+)` are `d^4, d^5, d^6` and `d^7` respectively. Which one of the following will exhibit minimum paramagnetic behavious?

Options

A. `[Co(H_2 O)_6]^(2+)`
B. `[Cr(H_2 O)_6]^(2+)`
C. `[Mn(H_2O)_6]^(2+)`
D. `[Fe(H_2 O)_6]^(2+)`

Answer

A

Explanation

`[Co(H_2 O)_6]^(2+)`