CH3-CH3---CH3-CH2Cl---C2H5-OH---CH2=CH2---CH3-CH2OH ? срочно

СH3-CH3 + Cl2 -> CH3-CH2-Cl + HCl

CH3-CH2-Cl + NaOH -> CH3-CH2-OH + NaCl

CH3-CH2-OH -> CH2=CH2 + H2

CH2=CH2 + H2O -> CH3-CH2-OH