Which of the following has acidic hydrogen?
Correct answer: A. Ethyne
- A. Ethyne
- B. Ethene
- C. Ethane
- D. Benzene
Explanation
Ethyne has a terminal C-H bond attached to an sp-hybridised carbon. Its high s-character makes this hydrogen relatively acidic compared with the hydrogens of ethene, ethane and benzene in the usual introductory organic chemistry sense. The likely mistake is choosing benzene because it is associated with acidic reactions, but benzene's C-H hydrogens are not classified as acidic here.
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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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