Aromaticity and Molecular Orbital Theory
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Questions and Answers

What is the characteristic of the lowest-lying molecular orbital in cyclic conjugated molecules?

  • It is the only orbital that is not degenerate (correct)
  • It is always empty
  • It comes in a degenerate pair with another orbital
  • It is the highest-energy orbital

    • What is the total number of electrons required to fill the lowest-lying orbital and n succeeding energy levels in cyclic conjugated molecules?

  • 4n + 2 (correct)
  • 2n + 2
  • 4n + 1
  • 2n + 1

    • What is the characteristic of an aromatic compound according to Huckel's rule?

  • It has an odd number of pi electrons
  • It has a non-planar structure
  • It has 4n + 2 pi electrons (correct)
  • It has a localized pi electron system

    • What is the reason for the equivalence of all C-C bonds in benzene?

    <p>The p orbitals on each carbon atom overlap equally well with neighbouring p orbitals on both sides</p> Signup and view all the answers

    What is the characteristic of an antiaromatic compound?

    <p>It has a localized pi electron system</p> Signup and view all the answers

    What is the reason for cyclooctatetraene not being aromatic?

    <p>It has 8 pi electrons, which is not a multiple of 4n + 2</p> Signup and view all the answers

    What is the main reason why the annulene with 10 π electrons is not aromatic?

    <p>The ring puckers to relieve the strain, preventing π electrons from delocalizing over the entire ring</p> Signup and view all the answers

    What is the condition for a heterocycle to be aromatic?

    <p>It must have at least one lone pair of electrons</p> Signup and view all the answers

    What is the result of increasing the number of fused benzene rings in Polycyclic Aromatic Hydrocarbons (PAHs)?

    <p>The number of resonance structures increases</p> Signup and view all the answers

    What is necessary for cyclic conjugation to occur in a molecule?

    <p>The molecule must have a planar ring with alternating double and single bonds</p> Signup and view all the answers

    What is the characteristic of a molecule that follows Huckel's rule?

    <p>It has a planar ring with $(4n + 2)$ π electrons</p> Signup and view all the answers

    What is the difference between benzene and napthalene in terms of resonance structures?

    <p>Benzene has two resonance structures, while napthalene has three</p> Signup and view all the answers

    What is the main difference between the lone pair of nitrogen in pyridine and the pi electrons in the aromatic ring?

    <p>The lone pair is localized on the nitrogen, while the pi electrons are delocalized.</p> Signup and view all the answers

    What is the hybridization of the carbon atoms in the pyridine ring?

    <p>sp2</p> Signup and view all the answers

    How many pi electrons are present in the pyridine ring?

    <p>6</p> Signup and view all the answers

    Why does pyridine obey Huckel's rule of aromaticity?

    <p>Because it has 6 pi electrons</p> Signup and view all the answers

    What is the shape of the p orbitals in the pyridine ring?

    <p>Perpendicular to the plane of the ring</p> Signup and view all the answers

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