The only alkyne which gives an aldehyde upon the addition of water ?
Correct answer: A. Ethyne
- A. Ethyne
- B. Propyne
- C. 1-butyne
- D. 2-butyne
Explanation
The hydration of alkynes typically follows Markovnikov's rule, producing a ketone. Ethyne (acetylene) is the exception; its hydration initially forms an unstable enol (vinyl alcohol) which immediately tautomerizes to an aldehyde (acetaldehyde).
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About Chemistry of Hydrocarbons
Hydrocarbons are studied through the structures and reactions of alkanes, alkenes, alkynes and aromatic compounds. Coverage includes free radical substitution in alkanes, electrophilic addition to carbon-carbon multiple bonds, benzene substitution, aromatic stability and the difference between addition reactions of alkenes and substitution reactions of benzene.
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