But-2-ene on reaction with alkaline at elevated temperature followed by acidification will give:
one molecule of and one molecule of
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.
option (1) is correct
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