Question

Write down the reaction involved in Baeyer's test of
C=C double bond.
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Answer 1

Refer the attachment

Hope it helps

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Answer 2

Bayer's test a laboratory test to point out  the presence of double bond in the given unsaturated compound.

In this reaction, unsaturated compound i.e. double bond is react with  dilute alkaline KMnO₄  to form vicinal glycols.

In this reaction KMnO₄ is absorb ,therefore, purple colour of potassium permanganate vanishes.  

Mechanism:

MnO₄⁻ attacks double bond to form complex which on hydrolysis give vicinal diols i.e. 1,2-diols.