Alkynes: Addition Reactions and Bond Energies
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Questions and Answers

Why do alkynes readily undergo addition reactions?

  • Because the pi bonds of alkynes are electron-rich, like alkenes (correct)
  • Because the pi bonds of alkynes are weaker than sigma bonds
  • Because the bond energy of the alkyne triple bond is lower than that of an alkene double bond
  • Because alkynes have only one pi bond

    • Why are the reactions of alkynes usually exothermic?

  • Alkynes release more energy during reactions
  • Pi bonds are generally stronger than sigma bonds
  • Sigma bonds are generally stronger than pi bonds (correct)
  • Alkynes have higher bond energy than alkenes

    • How many pi bonds do alkynes have?

  • None
  • One
  • Two (correct)
  • Three

    • Why should we consider the possibility of double addition when a reagent adds across the triple bond of an alkyne?

    <p>Because alkynes have two pi bonds</p> Signup and view all the answers

    Under what conditions might a reaction across the triple bond of an alkyne stop after a single addition?

    <p>Specific reaction conditions</p> Signup and view all the answers

    Alkynes have a higher bond energy than alkenes.

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

    Pi bonds in alkynes are electron-poor.

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

    Alkynes can only have one molecule add across the triple bond.

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

    Reactions across the triple bond of an alkyne never result in double addition.

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

    Sigma bonds are generally weaker than pi bonds in alkynes.

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

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