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Oxidation of alkene -
Alkene on reaction with cold dilute aqueous solution of KMnO4 (Bayers Reagent) produce vicinal glycol. Decolourisation of KMnO4 solution is used as a test of unsaturation.
- wherein
Option 1)
molecules of 
Option 2)
molecules of 
Option 3)one molecule of
and one molecule of 
Option 4)