1) CH4 + O2 = HCHO + H2O

2) HCHO + H2 = CH3OH

3) CH3OH + HCl = CH3Cl + H2O

4) 2CH3Cl + 2Na = C2H6 + 2NaCl

5) C2H6 = C2H4 + H2

6) C2H4 + H2O = C2H5OH

7) C2H5OH + O2 = CH3COOH + H2O