Question

Which of the following is Baeyer’sreagent?

• (A) Acidified ${\mathrm{KMnO}}_4$
• (B) Alkaline ${\mathrm{KMnO}}_4$
• (C) Acidified ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$
• (D) Aqueous ${\mathrm{KMnO}}_4$

Answer 1

The Correct Option is B

Explanation:
Alkaline ${\mathrm{KMnO}}_4$ is called Baeyer's reagent. Baeyer's reagent is an alkaline solution of cold potassium permanganate, which is a powerful oxidant making this a redox reaction. Reaction with double or triple bonds ($-C=C-$ or $-C\equiv C-)$ in an organic material causes the colour to fade from purplish-pink to brown. It is a syn addition reaction. Hence, the correct option is (B).