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Questions and Answers
Why do alkynes readily undergo addition reactions?
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?
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?
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?
Why should we consider the possibility of double addition when a reagent adds across the triple bond of an alkyne?
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Under what conditions might a reaction across the triple bond of an alkyne stop after a single addition?
Under what conditions might a reaction across the triple bond of an alkyne stop after a single addition?
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Alkynes have a higher bond energy than alkenes.
Alkynes have a higher bond energy than alkenes.
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Pi bonds in alkynes are electron-poor.
Pi bonds in alkynes are electron-poor.
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Alkynes can only have one molecule add across the triple bond.
Alkynes can only have one molecule add across the triple bond.
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Reactions across the triple bond of an alkyne never result in double addition.
Reactions across the triple bond of an alkyne never result in double addition.
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Sigma bonds are generally weaker than pi bonds in alkynes.
Sigma bonds are generally weaker than pi bonds in alkynes.
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