Account for following Cu (I) compounds are unstable in an aqueous solution and undergo disproportionation.
Cu + Cu + is more unstable in aqueous solution than Cu2 + Cu2 + because, while copper's 2nd I.E. is considerable, Cu2 + Cu2 + hydrations enthalpy is significantly lower than Cu + Cu + , and so it more than compensates for copper's 2nd I.E. As a result, many Cu + Cu + complexes in aqueous solution are unstable and disproportionate.
