3 задание, пожалуйста!!!
СH4 + Cl2 -> CH3-Cl + HCl (hv)
CH3-Cl + NaOH -> CH3-OH + NaCl
CH3-OH + HCl -> CH3-Cl + H2O
CH3Cl + 2Na+Cl-CH3 -> CH3-CH3 + 2NaCl