Write the reaction equation: CH4 → CH3Cl → C2H6 → C2H4⇄C2H5OH + [O] =? C2H4 → C2H5Cl C2H4 → C2H4Br2

Let’s write down the solution, compose the equations:
CH4 + Cl2 = CH3Cl + HCl – substitution reaction, methane chloride was obtained;
2СН3Cl + 2Na = 2NaCl + C2H6 – ethane was released during the Wurtz reaction;
C2H6 = H2 + C2H4 – dehydrogenation, ethylene was formed;
С2Н4 + Н2О = С2Н5ОН – hydration, ethanol was obtained;
С2Н5ОН = Н2О + С2Н4 – dehydration, ethylene is released;
С2Н5ОН + CuO = C2H4O + Cu + H2O – oxidation of ethanol with copper oxide, acetaldehyde is released;
С2Н4 + НCl = C2H5Cl – addition reaction, ethane chloride was formed;
Н2С = СН2 + Br2 = CH2Br – CH2Br (C2H4Br2) – ethylene bromination, dibromoethane was obtained.