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 tests can be used to detect the presence of an alkene in an organic compound?

Tollens' test

Fehling's test

Bromine water test

Iodoform test

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Verified step by step guidance

Understand the nature of alkenes: Alkenes are hydrocarbons that contain at least one carbon-carbon double bond (C=C). This double bond is a site of high electron density, making alkenes reactive towards certain reagents.

Identify the purpose of the tests: Each test mentioned is used to detect specific functional groups or types of compounds. For example, Tollens' test is used for aldehydes, Fehling's test is also for aldehydes, and the Iodoform test is for methyl ketones or alcohols with a methyl group adjacent to the hydroxyl group.

Focus on the Bromine water test: This test is specifically used to detect unsaturation in organic compounds, such as alkenes. When an alkene is present, the bromine (Br₂) in the bromine water reacts with the double bond, leading to a color change from brown to colorless.

Explain the reaction mechanism: The reaction between bromine and an alkene involves the addition of bromine across the double bond. This is an electrophilic addition reaction where the π-bond of the alkene attacks the bromine molecule, forming a cyclic bromonium ion intermediate, which is then attacked by a bromide ion to form a dibromoalkane.

Conclude why the Bromine water test is suitable: Since the Bromine water test specifically reacts with the double bond in alkenes, it is an effective method to confirm the presence of alkenes in an organic compound, unlike the other tests listed which are not suitable for detecting alkenes.