In which of the following changes, there is transfer of five electrons?

Options

A. `MnO_4^(-) to Mn^(2+)`
B. `CrO_4^(2-) to Cr^(3+)`
C. `MnO_4^(2-) to MnO_2`
D. `Cr_2O_7^(2-) to 2Cr^(3+)`

Answer

A

Explanation

`overset(+7)(Mn)O_4^(-) + 5e^(-) to Mn^(2+)`