CH3-CH3→CH2-CH2-OH→HO-CH2-CH2-OH

CH3 - CH3 ---t,Ni---> CH2 = CH2 + H23CH2 = CH2 + 2KMnO4 + 4H2O ---> 3HO - CH2 - CH2 - OH + 2KOH + 2MnO2