Organic Chemistry Reaction Quiz
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Questions and Answers

Which compound is least basic?

  • (correct)
  • (correct)
  • (correct)
  • (correct)

    • Which of the following is most reactive in electrophilic aromatic substitution?

  • (correct)
  • (correct)
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    • Which of the following is not true about the five-membered rings?

  • Five membered rings are more stable than 8 membered rings
  • Five membered rings are more stable than 4 membered rings
  • Five membered rings are more stable than 6 membered rings (correct)
  • Five membered rings are more stable than 7 membered rings

    • Which of the following five-membered rings is most resonance stabilized?

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

    Five-membered rings come under which category of heterocyclic classification on the basis of chemical behavior?

    <p>deficient heterocycle</p> Signup and view all the answers

    What is the reactivity order in the following five-membered heterocyclic compounds?

    <p>Pyrrole &gt; Furan &gt; Thiophene &gt; Pyridine</p> Signup and view all the answers

    What is the correct order of basicity of the five-membered heterocyclic compounds?

    <p>pyrrole &gt; furan &gt; thiophene</p> Signup and view all the answers

    Which of the following is not a five-membered ring?

    <p>All of the above</p> Signup and view all the answers

    Which electrophilic substitution reaction does pyridine not undergo?

    <p>Friedel-Crafts reaction</p> Signup and view all the answers

    What is the IUPAC name of the structure 1,2-diazete?

    <p>1,2-dihydro-1,2-diazete</p> Signup and view all the answers

    What is the common name of the structure of a six-membered ring containing two nitrogen atoms?

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

    What is the IUPAC name of 1-methyl-1H-indazole?

    <p>1-methyl-1H-benzo[b]pyrazole</p> Signup and view all the answers

    What is the name of a six-membered heterocyclic containing two nitrogen atoms?

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

    Compared to pyridine, imidazole is:

    <p>More basic</p> Signup and view all the answers

    What is the correct order of reactivity (most reactive first) of pyrrole, furan, and thiophene towards electrophiles?

    <p>Pyrrole &gt; Furan &gt; Thiophene</p> Signup and view all the answers

    Which of the following heterocyclic compounds has a five-membered ring with one nitrogen atom?

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

    Which statement about thiophene is incorrect?

    <p>Thiophene is less reactive than pyrrole</p> Signup and view all the answers

    Which drug possesses a pyrrole heterocyclic compound?

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

    What is the correct suffix for saturated 3-membered nitrogen heterocycles?

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

    Electrophilic substitution in furan usually occurs at which atom?

    <p>Both the C2 and C3 atoms</p> Signup and view all the answers

    Which of the following compounds has S and N atoms?

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

    Cinnoline is fused with a benzene ring to form a:

    <p>Five-membered ring</p> Signup and view all the answers

    Which of the following is a method of synthesizing pyridine?

    <p>Chichibabin reaction</p> Signup and view all the answers

    What is the IUPAC name of the structure below?

    <p>2H-1,4,5-Oxadiazine</p> Signup and view all the answers

    Which of the following derivatives of pyridine is mostly found in mammals?

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

    What is the correct IUPAC name of the structure below?

    <p>2H-oxete</p> Signup and view all the answers

    Which of the following is an example of cyclic ether?

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

    What is the correct IUPAC name of the structure below?

    <p>pyrimido[2,1-c][1,4]thiazine</p> Signup and view all the answers

    What is the correct IUPAC name of the structure below?

    <p>4-methylthieno[2,3-b]furan</p> Signup and view all the answers

    What is the correct IUPAC name of the structure below?

    <p>1H-benzo[g]indole</p> Signup and view all the answers

    Study Notes

    Heterocyclic Compounds

    • Heterocyclic compounds can be classified as excessive, deficient, or equivalent based on their chemical behavior.
    • Five-membered rings, such as furan, thiophene, and pyrrole, come under the category of equivalent heterocycles.
    • Pyridine, a six-membered ring, is an example of an excessive heterocycle.

    Reactivity of Heterocycles

    • Electrophilic substitution in furan usually occurs at the C2 and C3 atoms.
    • Thiophene is less reactive than pyrrole towards electrophiles.
    • Pyridine does not undergo electrophilic substitution.
    • The reactivity order of pyrrole, furan, and thiophene towards electrophiles is pyrrole > furan > thiophene.

    Basicity of Heterocycles

    • Imidazole is more basic than pyridine.
    • Pyridine is less basic than pyrrole.
    • The basicity of five-membered rings depends on the type of heteroatom and the resonance stabilization.

    Nomenclature of Heterocycles

    • The IUPAC name of a heterocycle depends on the type of heteroatom, the size of the ring, and the functional groups attached.
    • Examples of IUPAC names include pyrrole, furan, thiophene, pyridine, and pyrimidine.

    Synthesis of Heterocycles

    • The Chichibabin reaction is a method of synthesizing pyridine derivatives.
    • The Hantzsch pyridine synthesis is a method of synthesizing pyridine.
    • The Bonnemann cyclisation is a method of synthesizing heterocycles.

    Importance of Heterocycles

    • Heterocycles are found in many biomolecules, such as vitamins (e.g., Niacin) and amino acids.
    • Heterocycles have a wide range of applications in medicine, agriculture, and industry.

    Other Key Facts

    • Aziridine is a three-membered ring with one nitrogen atom.
    • Morpholine is a saturated six-membered ring with one oxygen atom and one nitrogen atom.
    • Cinnoline is a fused benzene ring with a five-membered ring.
    • Penicillin is an example of a drug that contains a heterocyclic compound.

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    Description

    Test your knowledge of organic chemistry reactions, including basicity, electrophilic aromatic substitution, and aromatic compounds.

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