The d-electron configuration 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 behaviour ? (At. Nos. Cr=24 , Mn=25 , Fe=26 , Co=27)

Options

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

Answer

D