The chemical reaction you provided is a series of reactions involving different compounds:

CH4 $Methane$ + Cl2 $Chlorine$ -> CH3Cl $Chloromethane$ + HCl $Hydrochloricacid$

CH3Cl $Chloromethane$ + C2H6 $Ethane$ -> C2H5Cl $Chloroethane$ + CH4 $Methane$

C2H5Cl $Chloroethane$ + OH- $Hydroxideion$ -> C2H5OH $Ethanol$ + Cl- $Chlorideion$

C2H5OH $Ethanol$ -> CO2 $Carbondioxide$ + H2O $Water$

These reactions involve halogenation, hydrolysis, and oxidation processes.