Aromatic Compounds Quiz

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Questions and Answers

What is the molecular formula of benzene?

  • C6H6
  • C5H8 (correct)
  • C6H12
  • C7H8

Which structure of benzene was preferred and accepted?

  • Kekule structure (correct)
  • Dewar structure
  • Cyclobutadiene
  • Linear chain structure

What rule predicts the aromatic character of a compound?

  • Huckel's rule (correct)
  • Markovnikov's rule
  • Saytzeff's rule
  • Zaitsev's rule

How many π electrons does benzene have?

<p>6 (A)</p> Signup and view all the answers

Why does benzene undergo substitution rather than addition?

<p>Because it has a stable ring structure (D)</p> Signup and view all the answers

What is the bond length of carbon-carbon bonds in benzene?

<p>1.39 Angstrom (B)</p> Signup and view all the answers

Which of the following is NOT a reason why the Kekule structure was accepted?

<p>Its carbon-carbon bonds are either much longer or shorter than 1.39 Angstrom (A)</p> Signup and view all the answers

What is required for a compound to be considered aromatic according to Huckel's rule?

<p>It must contain 4n+2 π electrons (B)</p> Signup and view all the answers

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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 Ï€ orbitals above and below the plane of the molecule.
  • The aromatic character of benzene can be predicted by counting the number of Ï€-electrons.
  • Huckel's rule states that aromatic properties are expected for planar, cyclic compounds containing 4n+2 Ï€ electrons in a closed circuit (where n is a whole number).
  • Benzene is an example of an aromatic compound, with six Ï€ electrons, satisfying Huckel's rule for n = 1.

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