Hyperconjugation
Hyperconjugation involves orbital overlap between:
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About This Question
- Subject
- chemistry
- Chapter
- some basic principles of organic chemistry
- Topic
- hyperconjugation
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
σ (C-H) and adjacent π or p orbital
Hyperconjugation (or no-bond resonance) is the delocalization of σ electrons of α−C−H bonds.
- Mechanism: It involves the overlap of the filled σ bonding orbital of a C−H bond with an adjacent empty p orbital (in carbocations) or a partially filled p orbital (in free radicals) or an antibonding π∗ orbital (in alkenes).
- This effect stabilizes the system and explains why 3∘ carbocations (having more α−H for hyperconjugation) are more stable than 1∘.
This medium difficulty chemistry question is from the chapter some basic principles of organic chemistry, covering the topic of hyperconjugation. It appeared in the 2025 exam.
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