Question

CH3-CH3->CH3-CH2-Cl->H2C=CH2->CH3-CH2-OH->H2C=CH-CH=CH2->(-CH2-CH=CH-CH2-)n

Answer 1

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