Which one of the following reactions indicates the reducing ability of hydrogen peroxide in basic medium?
1) 2H₂O₂ → 2H₂O + O2
2) 2H₂O₂ + 2OH⁻ → 2H₂O + O2 + 2e⁻
3) 2H₂O₂ + 2e⁻ → 2OH⁻ + O2
4) 2H₂O₂ + 2OH⁻ → 2H₂O + O2