Объяснение:
CH4 + Br2 -> CH3-Br + HBr (hy)
CH3-Br + 2Na + Br-CH3 -> CH3-CH3 + 2NaBr
CH3-CH3 -> CH2=CH2 + H2 ( t,kat)
CH2=CH2 + HCl -> CH3-CH2-Cl ( t, kat)
