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Q.

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

answer is B.

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Detailed Solution

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