Which of the following statements is not correct

Options

A. Cu liberates `H_2` atom acid
B. In its higher oxidation states , Mn forms stable compounds with oxygen and fluorine
C. `Mn^(3+) and Co^(+)` are oxidising agents in aqueous solution
D. `Ti^(2+) and Cr^(2+)` are reducing agents in aqueous solution

Answer

A