C2H2 -C2Ĥ4-C2Ĥ5CL-C2H4- полимер
C2H2 + H2 -> H2C=CH2 H2C=CH2 + HCl -> H3C-CH2-Cl H3C-CH2-Cl + KOH (спирт р-р) -> H2C=CH2 + KCl + H2O n H2C=CH2 -> [-H2C-CH2-] n