1)СH4 + Cl2 = CH3Cl + HCl 2)2CH3Cl +2 Na = CH3- CH3 + 2NaCl 3)CH3 - CH3 + Br2 = CH3CH2Br + HBr 4)2CH3 - CH2Br + 2Na = CH3 - CH2 - CH2 - CH3 + 2NaBr