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JAMB Chemistry 1992 Question 44

Question 44

Hydrocarbons

Which of the following compounds reacts with sodium metal as well as silver and copper salts?

  1. A.CH3C ≡ C—CH3
  2. B.CH3CH2CH2CH3
  3. C.CH3C ≡ CH
  4. D.CH3CH = CH CH3.
Show the answer and explanation

Answer: C (CH3C ≡ CH)

Explanation

Only a terminal alkyne has a hydrogen on a C≡C carbon, which is acidic enough to be replaced by sodium, silver or copper. Propyne is a terminal alkyne; but-2-yne is not.