First slide

Alkynes

Question

Which of the following compound decolorizes cold dilute alkaline $K M n O_{4}$ solution and also gives red ppt on heating with ammonical cuprous chloride.

Moderate

A

Propene
B

Acetylene
C

Ethene
D

But-2-yne

Solution

Acetylene has unsaturation so it can decolorize the pink color of cold dilute and alkaline $K M n O_{4}$ and it also has acidic hydrogens which can give red ppt with copper salts

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