The following statements are related to standard reduction potentials of the first row T.S. which is incorrect ?

Options

A. `E_(M^(2+)//M)^(ө)` for copper is positive `(0.34V)` accounts for its inability to liberate `H_(2)` from acids
B. The values of `E^(ө)` for Mn, Ni and Zn are more negative than expected from the trend
C. `E_(M^(3+)//M^(2+))^(ө)` for Mn ,Fe and Co are negative
D. `Co^(3+)//Co^(2+) gt Mn^(3+)//Mn^(2+) gt Fe^(3+)//Fe^(2+)` -decreasing order as oxidant