In which of the following, reduction of copper takes place?

1.
In which of the following, reduction of copper takes place?

1. Cu(s) + 1/2O2 (g) → CuO(s)2. Cu2+(aq) + 2I–(aq) → 2CuI(aq)3. CuCl2(s) + 2F–(aq) → CuF2 + Cl2(g)4. CuO + H2O → Cu(OH)2