Stability Of Alkenes
Easychemistry
Alkene stability increases with:
Select the correct option:
Solution
Incorrect! Answer:
Increased substitution and hyperconjugation
- Thermodynamic Data: Heats of combustion show that more highly substituted alkenes release less energy, meaning they are inherently more stable.
- Hyperconjugation: Alkyl groups attached to sp2 carbons have C−H σ-bonds that can overlap with the empty π∗ antibonding orbital. This delocalizes the electrons and stabilizes the molecule.
- Count: The number of hyperconjugative structures depends on the number of α-hydrogens. More alkyl groups → more α-hydrogens → Higher Stability.
- Order: Tetrasubstituted > Trisubstituted > Disubstituted > Monosubstituted.
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About This Question
- Subject
- chemistry
- Chapter
- hydrocarbons
- Topic
- stability of alkenes
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Increased substitution and hyperconjugation
- Thermodynamic Data: Heats of combustion show that more highly substituted alkenes release less energy, meaning they are inherently more stable.
- Hyperconjugation: Alkyl groups attached to sp2 carbons have C−H σ-bonds that can overlap with the empty π∗ antibonding orbital. This delocalizes the electrons and stabilizes the molecule.
- Count: The number of hyperconjugative structures depends on the number of α-hydrogens. More alkyl groups → more α-hydrogens → Higher Stability.
- Order: Tetrasubstituted > Trisubstituted > Disubstituted > Monosubstituted.
This easy difficulty chemistry question is from the chapter hydrocarbons, covering the topic of stability of alkenes. It appeared in the 2025 exam.
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