Elimination Reactions
Mediumchemistry
E2 elimination requires:
Select the correct option:
Solution
Incorrect! Answer:
Strong base and anti-periplanar geometry
The E2 (Elimination Bimolecular) mechanism involves the concerted removal of a proton and a leaving group.
- Base: Requires a strong base (EtO−,OH−,NH2−) to abstract the β-proton.
- Geometry: The reaction requires Anti-periplanar geometry. The C−H bond being broken and the C−X bond being broken must be in the same plane but in opposite directions (180∘ dihedral angle).
- This minimizes electronic repulsion between the electron-rich base and the leaving group.
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About This Question
- Subject
- chemistry
- Chapter
- organic compounds containing halogens
- Topic
- elimination reactions
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Strong base and anti-periplanar geometry
The E2 (Elimination Bimolecular) mechanism involves the concerted removal of a proton and a leaving group.
- Base: Requires a strong base (EtO−,OH−,NH2−) to abstract the β-proton.
- Geometry: The reaction requires Anti-periplanar geometry. The C−H bond being broken and the C−X bond being broken must be in the same plane but in opposite directions (180∘ dihedral angle).
- This minimizes electronic repulsion between the electron-rich base and the leaving group.
This medium difficulty chemistry question is from the chapter organic compounds containing halogens, covering the topic of elimination reactions. It appeared in the 2025 exam.
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