Propyne and propene can be distinguished by (a) conc. H₂SO₄ (b) Br₂ in CCl₄(c) dil. KMnO₄ (d) AgNO₃ in ammonia
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Propene, being an alkene, and propyne, being a alkyne, are distinguished using the common chemical tests namely ammoniacal silver nitrate or ammoniacal cuprous chloride. Thai is common test to differentiate alkene from alkyne. Ammoniacal silver nitrate is also called as Tollen's reagent.
When propyne is mixed with Ammoniacal silver nitrate a white precipitate is formed whereas there is no reaction when Tollen's reagent is added to propene.
It can depicted as
[/tex]Propyne + Ammoniacal Silver nitrate --> Silver acetylide(white ppt.) + NH₃ + H₂O[/tex]
Propene +Ammoniacal Silver Nitrate --> No reaction
Hence, form the options, the correct answer is
(d) AgNO₃ in ammonia
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