C2H5OH --(1)--> CH3CHO --(2)--> CH3COOH --(3)--> CH3COOCH3 --(4)--> C2H5OH --(5)--> CO2
1. C2H5OH + CuO → CH3CHO + Cu + H2O
2. CH3CHO + Ag2O --(NH3 * H2O)--> CH3COOH + 2Ag↓
3. CH3COOH + CH3OH → CH3COOCH3 + H2O
4.1 CH3COOCH3 + H2O → CH3COOH + CH3OH
4.2 CH3CHO + H2 --(NaAlH4)--> C2H5OH
5. C2H5OH + 3O2 → 2CO2↑ + 3H2O