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