Acetylene gives:
Correct answer: A. White precipitate with AgNO3 and red precipitate with Cu2Cl2
- A. White precipitate with AgNO3 and red precipitate with Cu2Cl2
- B. White precipitate with Cu2Cl2 and red precipitate with AgNO3
- C. White precipitate with both the reagents
- D. Red precipitate with both the reagents
Explanation
Terminal acetylene forms white silver acetylide with ammoniacal AgNO3 and red copper acetylide with ammoniacal cuprous chloride, written here as Cu2Cl2. The colours arise from different metal acetylide precipitates; students may choose the white-white option by remembering only the silver acetylide test.
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About Alkynes
Alkynes are unsaturated hydrocarbons containing a carbon-carbon triple bond, with sp-hybridised carbon atoms and a linear arrangement around the bond. The content includes nomenclature, preparation, acidity of terminal alkynes, and addition reactions with hydrogen, halogens, hydrogen halides and water, as well as oxidation.
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