`Cu^(+)` ion is not stable in aqueous solution because of disproportionation reaction. `E^(@)` value disproportionation of `Cu^(+)` is `(given E_(cu^(2+)//cu)^(@)=0.34 V)`

Options

A. - 0.19 V
B. 0.38
C. 0.94 V
D. - 0.38 V