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(D) Cold dilute alkaline $KMnO_4$ solution is known as Baeyer's reagent.$(A)$ Schiff's reagent is used to detect the presence of aldehydes.$(B)$ Tolle

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Baeyer's reagent

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(D) Cold dilute alkaline $KMnO_4$ solution is known as Baeyer's reagent.$(A)$ Schiff's reagent is used to detect the presence of aldehydes.$(B)$ Tollens' reagent is used to detect the presence of aldehydes.$(C)$ Fehling's reagent is used to detect the presence of aldehydes.$(D)$ Baeyer's reagent is used to test for the presence of unsaturation (double or triple bonds) in organic compounds,as it undergoes a color change from purple to brown due to the formation of $MnO_2$.

The presence of unsaturation in organic compounds can be tested with

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