Question

Distinguish between propane and propene with a chemical test

Answer 1

Answer. Propene does not react with alkaline KMnO4 solution.
          CH3-CH=CH2 + KMnO4 + H2O ———> No reaction
While alkenes decolorize the pink colour of acidified dilute solution of potassium permanganate. Propene decolorizes the pink colour of KMnO4 solution and forms propene glycol that is colorless compound.
         3CH3-CH=CH2+ 2KMn04 + 4H2O
    3GH3-HC (OH)-CH2 (OH) + 2MnO2 + 2KOH
This reaction is also used to test the unsaturation of an organic compound.

Comments

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