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

3. Acids and Bases

Organic Chemistry Reactions

Organic Chemistry

3. Acids and Bases

Organic Chemistry Reactions

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Multiple Choice

Which of the following statements about the reaction of alkenes with halogens is false?

Alkenes react with halogens in the presence of water to form halohydrins.

Alkenes react with halogens to form vicinal dihalides.

The reaction of alkenes with halogens involves a cyclic halonium ion intermediate.

Alkenes react with halogens to form alkynes.

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Verified step by step guidance

Begin by understanding the general reaction of alkenes with halogens. Alkenes are unsaturated hydrocarbons containing a carbon-carbon double bond, which is reactive towards halogens like chlorine (Cl₂) and bromine (Br₂).

Recognize that the typical reaction of alkenes with halogens results in the formation of vicinal dihalides. This occurs through the addition of halogen atoms across the double bond, resulting in a saturated compound.

Consider the mechanism of the reaction. The reaction often involves the formation of a cyclic halonium ion intermediate. This intermediate is formed when the halogen molecule approaches the alkene, leading to a temporary three-membered ring structure.

Understand the role of water in the reaction. When alkenes react with halogens in the presence of water, halohydrins are formed. Water acts as a nucleophile, opening the halonium ion and adding an OH group to one of the carbons.

Evaluate the false statement: 'Alkenes react with halogens to form alkynes.' This statement is incorrect because alkynes are formed by the removal of hydrogen atoms, not by the addition of halogens. The addition of halogens to alkenes does not result in the formation of alkynes.