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1) C2H5CHO + H2 = C3H7OH

2) C3H7OH = C3H6 + H2O

3) 3C3H6 + 2KMnO4 + 4H2O =
3CH2(OH)-CH(OH)-CH3 + 2KOH + 2MnO2

4) CH2(OH)-CH(OH)-CH3 + 2HBr =
CH2(Br)-CH(Br)-CH3 + 2H2O

5) C3H6Br2 + 2KOH = 2KBr + 2H2O + C3H4