Explain why $Cu^{+}$ ion is not stable in aqueous solutions?

(N/A) In an aqueous medium,$Cu^{2+}$ is more stable than $Cu^{+}$.
This is because,although energy is required to remove one electron from $Cu^{+}$ to form $Cu^{2+}$,the high hydration energy of $Cu^{2+}$ compensates for this energy requirement.
Therefore,$Cu^{+}$ ion in an aqueous solution is unstable and undergoes disproportionation to form $Cu^{2+}$ and $Cu$.
$2Cu_{(aq)}^{+} \to Cu_{(aq)}^{2+} + Cu_{(s)}$