Chemical Reactions and Organic Compounds Quiz
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Questions and Answers

Why does benzene not undergo electrophilic addition reactions?

  • It attracts nucleophiles instead of electrophiles.
  • Benzene is not reactive enough to undergo electrophilic addition.
  • It involves breaking up the stable delocalized ring of electrons. (correct)
  • It leads to the formation of aromatic amines.

    • Which type of reaction does benzene primarily undergo instead of electrophilic addition?

  • Free radical substitution
  • Addition polymerization
  • Nucleophilic substitution
  • Electrophilic substitution (correct)

    • What role does iron(III) bromide play in halogenation reactions involving benzene?

  • It forms a complex with the halogen product.
  • It generates the electrophile necessary for the reaction. (correct)
  • It stabilizes the benzene ring.
  • It acts as a reducing agent.

    • How can aromatic amines be produced from benzene?

    <p>By undergoing electrophilic substitution reactions</p> Signup and view all the answers

    What type of ion acts as the electrophile in a nitration reaction involving benzene?

    <p>NO2+</p> Signup and view all the answers

    Why is benzene described as an area of high electron density in electrophilic substitution reactions?

    <p>Due to the presence of a stable delocalized ring of electrons.</p> Signup and view all the answers

    Which type of reaction involves a molecule being broken down by its reaction with water?

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

    What happens to a species during oxidation?

    <p>Loses at least one electron</p> Signup and view all the answers

    What type of reaction produces a small molecule like water while forming a larger molecule?

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

    What makes benzene very stable compared to other molecules of similar size?

    <p>Delocalised ring electrons</p> Signup and view all the answers

    What was previously thought to be the structure of benzene before its actual structure was discovered?

    <p>Three double bonds and three single bonds</p> Signup and view all the answers

    Which type of compounds contain benzene rings as part of their structure?

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

    Why was the enthalpy change of hydrogenation of benzene lower than expected?

    <p>Benzene is more stable than the suggested cyclohexatriene structure predicted.</p> Signup and view all the answers

    What does X-ray diffraction data reveal about benzene's bond lengths?

    <p>All bond lengths are the same, unlike cyclohexatriene's varied lengths.</p> Signup and view all the answers

    How does benzene's resistance to electrophilic addition reactions differ from alkenes?

    <p>Alkenes undergo electrophilic addition reactions while benzene is resistant to them.</p> Signup and view all the answers

    What did the infrared data collected from benzene molecules reveal?

    <p>The cyclohexatriene structure did not explain the infrared data.</p> Signup and view all the answers

    Why did the enthalpy change of hydrogenation for benzene initially predict a value of -360 kJ mol-1?

    <p>Benzene was thought to have a structure different from cyclohexatriene.</p> Signup and view all the answers

    How does benzene's stability compare to that predicted by the cyclohexatriene structure?

    <p>Benzene is more stable than what the cyclohexatriene structure suggests.</p> Signup and view all the answers

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