Baeyer's reagent is

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Very dilute cold acidified $K_{2} {Cr}_{2} O_{7}$

Very dilute cold alkaline ${KMnO}_{4}$

Very dilute cold acidified ${KMnO}_{4}$

Hot and concentrated alkaline ${KMnO}_{4}$

answer is C.

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Detailed Solution

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 color to fade from purplish-pink to brown.

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