Which of the following is the best reductant?

Options

A. `Co^(2+)` (aq)
B. `Fe^(2+)` (aq)
C. `Cr^(2+)` (aq)
D. `Cu^(2+)` (aq)

Answer

C

Explanation

`Cr^(2+)//Cr^(3+)` has maximum SOP