Table of contents

1. A Review of General Chemistry5h 5m
2. Molecular Representations1h 14m
3. Acids and Bases2h 46m
4. Alkanes and Cycloalkanes4h 17m
5. Chirality3h 39m
6. Thermodynamics and Kinetics1h 22m
7. Substitution Reactions1h 48m
8. Elimination Reactions2h 30m
9. Alkenes and Alkynes2h 9m
10. Addition Reactions3h 19m
11. Radical Reactions1h 58m
12. Alcohols, Ethers, Epoxides and Thiols2h 42m
13. Alcohols and Carbonyl Compounds2h 17m
14. Synthetic Techniques1h 26m
15. Analytical Techniques:IR, NMR, Mass Spect7h 3m
16. Conjugated Systems6h 13m
17. Ultraviolet Spectroscopy51m
18. Aromaticity2h 34m
19. Reactions of Aromatics: EAS and Beyond5h 1m
20. Phenols55m
21. Aldehydes and Ketones: Nucleophilic Addition4h 56m
22. Carboxylic Acid Derivatives: NAS2h 51m
23. The Chemistry of Thioesters, Phophate Ester and Phosphate Anhydrides1h 10m
24. Enolate Chemistry: Reactions at the Alpha-Carbon1h 53m
25. Condensation Chemistry2h 9m
26. Amines1h 43m
27. Heterocycles2h 0m
28. Carbohydrates5h 53m
29. Amino Acids4h 20m
30. Peptides and Proteins2h 42m
31. Catalysis in Organic Reactions1h 30m
32. Lipids 2h 50m
33. The Organic Chemistry of Metabolic Pathways2h 52m
34. Nucleic Acids1h 32m
35. Transition Metals6h 14m
36. Synthetic Polymers1h 49m

16. Conjugated Systems

Reactions at the Allylic Position

Organic Chemistry

16. Conjugated Systems

Reactions at the Allylic Position

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Multiple Choice

Which of the following compounds will undergo E2 elimination at the fastest rate?

Both will proceed at equal rates.

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Verified step by step guidance

Identify the type of elimination reaction: E2 elimination is a bimolecular process where the base removes a proton from the β-carbon, and the leaving group departs simultaneously, forming a double bond.

Examine the structure of compound I: It is a secondary alkyl bromide, which is a good candidate for E2 elimination due to the presence of a β-hydrogen and a good leaving group (Br).

Examine the structure of compound II: It is also a secondary alkyl bromide, but it has an additional double bond in conjugation with the leaving group, which can stabilize the transition state and potentially increase the rate of elimination.

Consider the factors affecting E2 elimination rate: The presence of a conjugated system in compound II can stabilize the transition state through resonance, making the elimination faster compared to compound I.

Conclude which compound undergoes E2 elimination faster: Compound II, due to the stabilization provided by the conjugated double bond, will undergo E2 elimination at a faster rate than compound I.