C-CH4-CH3CL-C2H6-C2H4-C2H5OH
1)С+2H2=CH4 2)CH4+Cl2=CH3CL+HCl 3)2CH3CL+2NaOH=2NaCl+C2H4+H2O 4)C2H4+H2O=C2H5OH