Out of Alkane, Alkene & Alkyne, which one is more acidic?
Correct answer: C. Alkyne
- A. Alkane
- B. Alkene
- C. Alkyne
- D. All have same
Explanation
A terminal alkyne is more acidic because its conjugate base places the negative charge on an sp-hybridised carbon, which has greater s-character and stabilises the charge. The likely wrong choice is alkene, because students may think a double bond automatically makes hydrogen more acidic, but alkene carbons are only sp2-hybridised.
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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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