Which one of the following organic compound has the least carbon - carbon bond length?
Correct answer: C. Ethyne
- A. Ethane
- B. Ethene
- C. Ethyne
- D. Methane
Explanation
Option A is incorrect as Alkanes have the highest bond length (of about 1.54 Angstrom). Option B is incorrect as Alkenes have a lower bond length (of about 1.34 Angstrom). Option C is correct as Alkynes have the lowest bond length (of about 1.20 Angstrom). Option D is incorrect due to similar reasons as stated for Alkanes in option A. Note: The unsaturated compounds have lower bond lengths due to high e- density.
This question appeared on the HEC Phase I 2017 paper, which you can sit online with every answer explained.
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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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