Considering the stability of Cu(II) and Cu(I) which of the following statements is true?

Cu(II) is more stable

The correct answer is Option (1) → Cu(II) is more stable

In aqueous solution:

• Cu²⁺ is more stable than Cu⁺, because Cu⁺ tends to undergo disproportionation:

$2Cu^+ \rightarrow Cu^{2+} + Cu$

• The stability of Cu(I) depends on the anion and solvent, but generally Cu(II) is more stable.