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Reagent used to test unsaturation in alk...

Reagent used to test unsaturation in alkenes is

A

`NaOH+CaO`

B

Cold dilute alkaline `KMnO_(4)`

C

`Cl_(2)//hupsilon`

D

`KOH//C_(2)H_(5)OH`

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The correct Answer is:
B
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