Propene and propyne can be distinguished by

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(C) Propene $(CH_3-CH=CH_2)$ is an alkene and does not react with ammoniacal silver nitrate $(AgNO_3 + NH_4OH)$.Propyne $(CH_3-C \equiv CH)$ is a term

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$AgNO_3 + NH_4OH$

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(C) Propene $(CH_3-CH=CH_2)$ is an alkene and does not react with ammoniacal silver nitrate $(AgNO_3 + NH_4OH)$.Propyne $(CH_3-C \equiv CH)$ is a terminal alkyne with an acidic hydrogen atom.It reacts with ammoniacal silver nitrate to form a white precipitate of silver propynide $(CH_3-C \equiv C^- Ag^+)$.Therefore,$AgNO_3 + NH_4OH$ (Tollens' reagent) is used to distinguish between terminal alkynes and alkenes.

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