Ethene and Ethyne can be distinguished by employing the test:
Correct answer: D. Tollen's reagent
- A. Br2 in organic solvent
- B. Baeyer's reagent
- C. Phenyl Hydrazine
- D. Tollen's reagent
Explanation
The correct answer is Tollen's reagent. Ethene does not react with Tollen's reagent, whereas Ethyne reacts with it to form a white precipitate of silver acetylide, allowing for their differentiation. Br2 in an organic solvent cannot distinguish between Ethene and Ethyne as both will decolorize the solution. Baeyer's reagent (dilute KMnO4) reacts with Ethene but not significantly with Ethyne under the same conditions, requiring stronger conditions for Ethyne. Phenyl Hydrazine does not react with either compound, making it ineffective for distinction.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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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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