MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Organic ChemistryHydrocarbonsPhysical & Chemical Properties of Alkenes

Which of the following will decolorise alkaline KMnO4 solution?

A.C3H8

B.CH4

C.CCl4

D.C2H4✓ Correct

Explanation

Alkenes on reaction with potassium permanganate gives vicinal glycols and brown colored precipitates of 2 MnO . The formation of these brown colored precipitates results in the discharge of pink colored 4 KMnO . C CH3 CH3 O + H3C C CH3 O O3 Zn/H2O C C R R R R KMnO4 (Colored) Pink C C R R R R OH OH MnO4 Decolored (Brown ppt.) Vicinal Glycols Alkenes + HYDROCARBONS 14

Back to Question Bank

Practice More Like This

Take chapter-wise tests, track your progress, and master Hydrocarbons.

Start Free Practice →