Question

Baeyer’s reagent is ______.

विकल्प

• aqueous solution of KCl.

• aqueous solution of K₂Cr₂O₇.

• aqueous solution of KMnO₄.

• None of the above.

Answer 1

Baeyer’s reagent is aqueous solution of KMnO₄.

Explanation:

Baeyer’s reagent is a cold, dilute, alkaline aqueous solution of potassium permanganate used in qualitative organic analysis. It acts as an oxidising agent that reacts with unsaturated hydrocarbons (alkenes and alkynes) via syn-hydroxylation to form vicinal diols. During this reaction, the reagent’s characteristic purple colour fades and a brown precipitate of manganese dioxide (MnO₂) forms, confirming the presence of a double or triple bond.