Да Дарья 2CH4 --> C2H2 + 3H2 C2H2 + H2O (Hg(2+)) --> CH3CHO CaCO3 (t) --> CaO + CO2 CaO + 3C --> CaC2 + CO CaC2 + 2H2O --> C2H2 + Ca(OH)2 C2H2 + HCl --> CH3=CHCl nCH3=CHCl --> (-CH2-CHCl-)n