For the four successive transition elements (Cr, Mn, Fe and Co), the stability of + 2 oxidation state will be in which of the following order -

Options

A. `Mn gt Fe gt Cr gt Co`
B. `Fe gt Mn gt Co gt Cr`
C. `Co gt Mn gt Fe gt Cr`
D. `Cr gt Mn gt Co gt Fe`

Answer

A

Explanation

`Mn^(2+):3d^(5)4s^(0), Fe^(2+):3d^(6)4s^(0), Cr^(2+):3d^(4)4s^(0), Co^(2+):3d^(7)4s^(0)` Because of stable half filled configuration, `Mn^(2+)` is more stable among all.