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Which of the following is Baeyer’sreagent?(a) Acidified KMnO4(b) Alkaline KMnO4(c) Acidified K2Cr2O7(d) Aqueous KMnO4The question was posed to me by my college director while I was bunking the class.The question is from D and F-Block Elements topic in portion D and F-Block Elements of Chemistry – Class 12

Answer»

Correct choice is (b) Alkaline KMnO4

Easiest explanation: Alkaline KMnO4 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≡C-) in an organic material causes the colour to fade from purplish-pink to brown. It is a SYN addition reaction.



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