Correct option is 3Very dilute cold alkaline KMnO4

Baeyer's reagent is

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Very dilute cold acidified KMnO4

Very dilute cold acidified K2Cr2O7

Very dilute cold alkaline KMnO4

Hot and concentrated alkaline KMnO4

answer is C.

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Detailed Solution

* Cold dilute alkaline KMnO4 is called Baeyers reagent.* Baeyers reagent is used for Synhydroxylation.* The addition of two "OH" groups across the double bond is called hydroxylation.* Baeyers reagent acts as oxidising agent.* Alkenes decolourises the KMnO4 pink colour,hence KMnO4 is used to detect the unsaturation in the given organic compound.

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