The C-C bond length in benzene is
Correct answer: D. intermediate between C-C bond length in ethane and C-C bond length in ethylene.
- A. greater than the C-C bond length in ethane.
- B. shorter than the C-C bond length in ethylene
- C. Same as that of C-C bond length in ethylene
- D. intermediate between C-C bond length in ethane and C-C bond length in ethylene.
Explanation
Benzene is a planar cyclic compound consisting of six carbon atoms and six hydrogen atoms. The carbon-carbon bonds in benzene are hybridized and have a bond length of 1.39 Å.Ethane is a saturated hydrocarbon with two carbon atoms and six hydrogen atoms. The carbon-carbon bonds in ethane are single bonds and have a bond length of 1.54 Å.Ethylene is an unsaturated hydrocarbon with two carbon atoms and four hydrogen atoms. The carbon-carbon bond in ethylene is a double bond and has a bond length of 1.34 Å.Since benzene has alternating double bonds, it has a resonance structure. The carbon-carbon bonds in benzene are not entirely single or double bonds, but intermediate between the two. Hence, the C-C bond length in benzene is intermediate between the C-C bond in ethane and the C-C bond length in ethylene.
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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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