Здійснити перетворення: СН4→СН3Сl→C2H6→C2H5Cl→C2H5OH→CH3CHO→CH3COOH.
CH4+Cl2=CH3Cl+HCl
2CH3Cl+2Na=C2H6+2NaCl
C2H6+Cl2=C2H5Cl+HCl
C2H5C+NaOH=C2H5OH+NaCl
C2H5OH+СuO--->CH3COH+Cu+H2O
CH3COH+Ag2O--->CH3COOH+2Ag