How can propyne and propene be distinguished?

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(D) Propyne $(CH_3-C \equiv CH)$ is a terminal alkyne,which contains an acidic hydrogen atom. Terminal alkynes react with ammoniacal silver nitrate ($

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Ammoniacal $AgNO_3$

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(D) Propyne $(CH_3-C \equiv CH)$ is a terminal alkyne,which contains an acidic hydrogen atom. Terminal alkynes react with ammoniacal silver nitrate ($AgNO_3$ in $NH_4OH$) to form a white precipitate of silver acetylide $(CH_3-C \equiv C-Ag)$. Propene $(CH_3-CH=CH_2)$ is an alkene and does not contain acidic hydrogen,so it does not react with ammoniacal $AgNO_3$. Thus,ammoniacal $AgNO_3$ is used to distinguish between them.

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