2СН4-->С2Н2+3Н2 (t=1500°C)C2H2+H2O-->CH3CHO (кат. HgSO4/H2SO4)CH3CHO+H2-->C2H5OH (t, Ni)C2H5OH+HBr-->C2H5Br+H2OC2H5Br+KOH(спирт. р-р)-->С2Н4+KBr+H2OC2H4+H2O-->C2H5OH (кат. H+)C2H5OH+CuO-->CH3CHO+H2O+CuCH3CHO+Ag2O-->CH3COOH+2Ag↓CH3COOH+NaOH-->CH3COONa+H2O