СH=-CH  + 2H2 -> CH3-CH3

CH3-CH3  +  Cl2 -> CH3-CH2-Cl + HCl

CH3-CH2-Cl + 2Na + Cl-CH2-CH3 -> CH3-CH2-CH2-CH3 + 2NaCl

CH3-CH2-CH2-CH3 + Br2 -> CH3-CH2-CH2-CH2-Br + HBr

CH3-CH2-CH2-CH2-Br + NaOH -> CH3-CH2-CH2-CH2-OH + NaBr