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Which of the following compound decolorizes cold dilute alkaline KMnO4 solution and also gives red ppt on heating with ammonical cuprous chloride.

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a
Propene
b
Acetylene
c
Ethene
d
But-2-yne

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detailed solution

Correct option is B

Acetylene  has unsaturation so it can decolorize the pink color of cold dilute and alkaline KMnO4 and it also has acidic hydrogens which can give red ppt with copper salts

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