Ch3-ch3-> ch3-ch2-cl-> h2c=ch2-> ch3-ch2-oh-> h2c=ch-ch=ch2-> (-ch2-ch=ch-ch2-)n

СH₃-CH₃ + Cl₂ ---> CH₃-CH₂-Cl + HCl
CH₃-CH₂-Cl  ---> CH₂=CH₂ + HCl
CH₂=CH₂ + H₂O --> CH₃-CH₂-OH 
2CH₃-CH₂-OH > CH₂=CH-CH=CH₂ + 2H₂O + H₂ (t) 
nCH₂=CH-CH=CH₂ ---> (-CH₂-CH=CH-CH₂-)n