When treated with ammonical cuprous chloride, which of the following forms copper derivates?
Correct answer: C. C2H2
- A. C2H6
- B. C2H4
- C. C2H2
- D. C6H6
Explanation
Only alkynes can perform this reaction. 2[Cu(NH)3]OH + HC≡CH → Cu−C≡C−Cu + 4NH3 + 2H2O copper acetylide Red ppt.
This question appeared on the ETEA MDCAT 2008 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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