Which of the following hydrocarbons has the shortest C-C bond length?
Correct answer: C. HC≡CH
- A. CH2=CH2
- B. CH3CH3
- C. HC≡CH
- D. Benzene
Explanation
Ethyne contains a carbon-carbon triple bond, which has a bond length of around 1.20 Å. The triple bond is shorter than a double bond because it involves more electron density sharing between the carbon atoms. The triple bond is also relatively strong and reactive due to the high electron density and the presence of two pi bonds.
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Organic chemistry begins with carbon compounds classified by carbon skeleton, saturation and functional group. Work includes identifying groups such as hydroxyl, carbonyl, carboxyl and amino, applying basic nomenclature, and distinguishing structural, geometric and optical isomers, where the same molecular formula does not necessarily mean the same structure or properties.
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