2CH4--(t)-> C2H2 + 3H2
C2H2---( C, t)---> C6H6
C6H6 + Cl2 ---> C6H5Cl + HCl
C6H5Cl+ Cl2---> C6H4Cl2 + HCl
C6H4Cl2+ Cl2--->C6H3Cl3 + HCl
2CH4--(t)-> C2H2 + 3H2
C2H2---( C, t)---> C6H6
C6H6 + Cl2 ---> C6H5Cl + HCl
C6H5Cl+ Cl2---> C6H4Cl2 + HCl
C6H4Cl2+ Cl2--->C6H3Cl3 + HCl