What type of reaction converts an alkene to a vicinal diol using cold dilute alkaline potassium permanganate (Baeyer's reagent)?
Answer and explanation
Correct answer: C. Syn-dihydroxylation
Cold dilute alkaline KMnO4 adds two hydroxyl groups across the double bond simultaneously from the same face via a cyclic manganate ester intermediate, resulting in syn-dihydroxylation to form a cis-1,2-diol and a brown MnO2 precipitate.
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