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Questions and Answers
What is the molecular formula of benzene?
What is the molecular formula of benzene?
Which structure of benzene was preferred and accepted?
Which structure of benzene was preferred and accepted?
What rule predicts the aromatic character of a compound?
What rule predicts the aromatic character of a compound?
How many π electrons does benzene have?
How many π electrons does benzene have?
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Why does benzene undergo substitution rather than addition?
Why does benzene undergo substitution rather than addition?
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What is the bond length of carbon-carbon bonds in benzene?
What is the bond length of carbon-carbon bonds in benzene?
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Which of the following is NOT a reason why the Kekule structure was accepted?
Which of the following is NOT a reason why the Kekule structure was accepted?
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What is required for a compound to be considered aromatic according to Huckel's rule?
What is required for a compound to be considered aromatic according to Huckel's rule?
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Study Notes
Aromatic Compounds
- Aromatic compounds are one of the two major classes of organic compounds, the other being aliphatic compounds.
Benzene
- Benzene's molecular formula is C6H6 and it has been known since 1825.
- Benzene has several proposed structures, including Kekule, Dewar, and linear chain structures.
Kekule Structure
- The Kekule structure is a six-membered ring with alternating single and double bonds.
- The Kekule structure is preferred due to several reasons, including:
- Yields only one substitution product
- Yields three isomeric distribution products
- Undergoes substitution rather than addition
- Carbon-carbon bonds in benzene are equal in length (1.39 Angstrom)
Aromatic Character
- Aromatic compounds have a ring of π orbitals above and below the plane of the molecule.
- The aromatic character of benzene can be predicted by counting the number of π-electrons.
- Huckel's rule states that aromatic properties are expected for planar, cyclic compounds containing 4n+2 π electrons in a closed circuit (where n is a whole number).
- Benzene is an example of an aromatic compound, with six π electrons, satisfying Huckel's rule for n = 1.
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Description
Test your knowledge of aromatic compounds, including benzene and its structures, such as the Kekule structure.
