Решите : c2h4-c2h5oh-ch3coh-ch3cooh-ch3coona

1) CH2=CH2 + H2O =[300°C, H3PO4]=> CH3-CH2-OH
2) CH3-CH2-OH + CuO =[t°C]=> CH3-CHO + Cu + H2O
3) CH3-CHO + Ag2O =[NH4OH, t°C]=> CH3-COOH + 2Ag{осадок}
4) CH3-COOH + NaOH => CH3-COONa + H2O