$\begin {array} {1 1} (A) \text{Copper (I) disproportionates to Cu and Cu (II) is aqueous solution} \\ (B)\;\text{Copper (I) can be stabilized by the formation of insoluble complex compounds such $CuCl^-_2$ and $Cu(CN)^-_2$} \\ (C)\;\text{Copper (II) oxide is red powder} \\ (D)\;\text{Copper sulphate molecule is associated with five molecules of water} \end {array}$
