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Free Alkynes MCQs with Answers

43 Alkynes MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.

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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43 questions · page 3 of 3

41. Hydration of hydrocarbon give carbonyl compound, the general formula of that hydrocarbon is:

  • A. CnH2n+2
  • B. CnH2n
  • C. CnH2n-2
  • D. Both CnH2n and CnH2n-2

Explanation: Alkynes on hydration in the presence of H2SO4 and HgSO4 yield carbonyl compounds through enolAll alkynes except ethyne give ketones while…

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Correct answer: CnH2n-2

42. Which of the following hydrocarbons give acid base reaction?

  • A. Toluene
  • B. 2-butyne
  • C. 1-butyne
  • D. 2-butene

Explanation: EToluene, which is a hydrocarbon, does not typically undergo acid-base reactions.

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Correct answer: Toluene

43. When excess of HCI is added to acetylene, the product is:

  • A. Vinyl chloride
  • B. Ethyl chloride
  • C. 1,2 - dichloroethane
  • D. 1,1 - dichloroethane

Explanation: When excess hydrochloric acid (HCl) is added to acetylene (C2H2), the product formed is 1,2 - dichloroethane (C2H4Cl2).

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Correct answer: 1,2 - dichloroethane
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