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GK QUESTION#3266

Which radical has formula C₂H and is obtained by removing one hydrogen atom from acetylene?

  1. AEthynylCorrect answer
  2. BPropargyl
  3. CVinyl
  4. DAllyl
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Answer

A. Ethynyl

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Explanation

Removing one hydrogen atom from acetylene, HC≡CH, gives the ethynyl radical, C₂H. Vinyl has formula C₂H₃, while propargyl and allyl have three carbon atoms. The species requested is a radical, not a stable closed-shell hydrocarbon molecule.

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