C2H5OH---CH3-COH---CH3-COOH---CH2CL-COOH

С2H5OH---(t,Cu)-->CH3-COH+H2
5CH3-COH+2KMnO4+3H2SO4--->5CH3-COOH+K2SO4+2MnSO4+3H2O
CH3-COOH+Cl2---(Pкрасный)--> Cl-CH2-COOH + HCl