Цепочка превращения. co = c3h8 = пропен =(+h2o, h, t) x= пропен=(+kmno4, h2o, 20°)x2

1) 6CO+8H2=2C3H8+O2
2) C3H8 -> t -> C3H6 + H2
3) CH2=CH-CH3 + H2O -> CH3-CHOH-CH3
4) CH3-CHOH-CH3 -> t -> CH2=CH-CH3 + H2O
5) 3CH2=CH-CH3 + 2KMnO4 + 4H2O -> 3CH2OH-CHOH-CH3 + 2MnO2 + 2KOH 
вас.