With the same d-orbital configuration (da) C^2+ is a reducing agent while Mn^3+ is an oxidizing agent?

Question

 How would you account for the following :

 With the same d-orbital configuration (da) C²⁺ is a reducing agent while Mn³⁺ is an oxidizing agent?

Answer 1

Cr (24) = 3d⁵4s¹

Configuration . of Cr⁺³ = 3d⁴

As Cr⁺³ has stable t³_2g configuration so Cr⁺² has a tendency to change to Cr⁺³ hence it is a reducing agent.

Mn (25) =3d⁵4s²

Mn⁺³ = 3d⁴

Mn⁺³ changes to Mn⁺³ (3d)⁵ which is half filled state configuration. Hence Mn⁺³ acts as oxidising agent.