Aromatic L1
35 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What term best describes the structure of benzene?

  • Resonance hybrid (correct)
  • Aliphatic compound
  • Linear molecule
  • Aromatic isomer

    • Why is benzene often represented with alternating double bonds in structural formulas?

  • To indicate the presence of lone pairs
  • To emphasize its reactivity
  • To simplify electron counting (correct)
  • To show its linear structure

    • What is the enthalpy change for the reduction of benzene to cyclohexatriene?

  • -152 kJ/mol
  • -231 kJ/mol
  • -208 kJ/mol (correct)
  • -120 kJ/mol

    • Which type of reaction does benzene usually prefer over addition reactions?

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

    What is essential for aromaticity, according to the information provided?

    <p>Cyclic conjugated systems</p> Signup and view all the answers

    In the context of benzene stability, what do unusual reactivity and preference for substitution suggest?

    <p>High thermal stability</p> Signup and view all the answers

    What did Kekulé propose as the structure of benzene?

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

    Why did Kekulé's earlier theory break when applied to benzene?

    <p>Carbon lacked a 4th valence</p> Signup and view all the answers

    Why did Kekulé suggest that benzene was in rapid equilibrium between two isomers?

    <p>To explain the missing isomer of dibromo benzene</p> Signup and view all the answers

    Which type of reaction does benzene undergo due to the stable nature of its resonance hybrid?

    <p>Substitution reactions</p> Signup and view all the answers

    Why does benzene not react like a typical alkene despite having double bonds in its structure?

    <p>Presence of resonance stabilization</p> Signup and view all the answers

    How does the presence of delocalized electrons in benzene contribute to its stability?

    <p>Enhances its resonance energy</p> Signup and view all the answers

    Which technique showed that benzene has a symmetric hexagonal structure?

    <p>X-ray diffraction</p> Signup and view all the answers

    What is the approximate C-C bond length in benzene?

    <p>1.44 Å</p> Signup and view all the answers

    Why are chemical resonance hybrids only available for compounds with delocalized electrons?

    <p>Delocalized electrons allow for free electron movement</p> Signup and view all the answers

    What effect does the freedom of electron movement have on the stability of a molecule?

    <p>Increases stability</p> Signup and view all the answers

    In a resonance hybrid, which part of the molecule can participate in electron movement?

    <p>$\pi$-bonds and lone pairs</p> Signup and view all the answers

    What must stay constant in a molecule's resonance hybrid?

    <p>Number of electrons</p> Signup and view all the answers

    What is the main reason why aromatic compounds are so common in drugs and other applications?

    <p>Their ability to form multiple resonance hybrids</p> Signup and view all the answers

    Which of the following drugs is NOT classified as an aromatic compound based on the information provided?

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

    Based on the lecture, how many out of 100 drugs discussed are aromatic compounds?

    <p>86</p> Signup and view all the answers

    What role do delocalized electrons play in the stability of aromatic compounds?

    <p>They contribute to resonance stabilization, increasing stability</p> Signup and view all the answers

    How do aromatic compounds differ from aliphatic compounds in terms of electron movement?

    <p>Aromatic compounds demonstrate delocalized electron movement</p> Signup and view all the answers

    What aspect of aromatic compounds makes them suitable for applications like medicines and dyes?

    <p>Their diverse electron delocalization that enhances stability</p> Signup and view all the answers

    What was the name given to the new compound isolated by Faraday from illuminating gas in 1825?

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

    How many degrees of unsaturation or ring systems does the molecular formula C6H6 indicate?

    <p>4</p> Signup and view all the answers

    Who established the molecular formula of benzene (C6H6) based on vapor density?

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

    What describes benzene's properties in terms of Resonance Stabilization?

    <p>Resonance of pi electrons over all six carbon atoms</p> Signup and view all the answers

    How does the chemistry of benzene compare to other 'unsaturated' compounds?

    <p>Benzene shows unique stability due to resonance hybridization</p> Signup and view all the answers

    What term best describes the structure of benzene in relation to electron movement?

    <p>Electron mobility across the ring</p> Signup and view all the answers

    Explain the reactivity of benzene towards bromine.

    <p>Benzene can be brominated using FeBr3 as a catalyst, leading to substitution reactions.</p> Signup and view all the answers

    What was Kekulé's proposal to explain the reactivity of benzene?

    <p>Kekulé proposed that benzene exists as two isomers in rapid equilibrium.</p> Signup and view all the answers

    Why did Kekulé's earlier theory break when applied to benzene?

    <p>Kekulé's earlier theory broke because carbon in benzene needed a 4th valence, contradicting his own theory from 1859.</p> Signup and view all the answers

    How does benzene's reactivity differ from that of alkenes?

    <p>Benzene does not react like alkenes because it prefers substitution reactions over addition reactions.</p> Signup and view all the answers

    What did Kekulé propose to explain the preference for substitution over addition in benzene?

    <p>Kekulé suggested that benzene exists as two isomers in rapid equilibrium, accounting for the preference for substitution.</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser