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

Acids and Bases

Organic Chemistry

3. Acids and Bases

Acids and Bases

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Multiple Choice

Which of the following statements is not true about the acidity of carboxylic acids?

The presence of electron-withdrawing groups increases the acidity of carboxylic acids.

Carboxylic acids are generally stronger acids than alcohols.

The acidity of carboxylic acids is due to the resonance stabilization of their conjugate base.

Carboxylic acids cannot donate protons in aqueous solutions.

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Verified step by step guidance

Identify the key functional group in carboxylic acids, which is the carboxyl group (-COOH). This group is responsible for the acidic properties of carboxylic acids.

Understand that the acidity of carboxylic acids is primarily due to the ability of the carboxyl group to donate a proton (H+) to form a carboxylate ion (RCOO-).

Recognize that the carboxylate ion is resonance-stabilized, meaning the negative charge can be delocalized over the two oxygen atoms, which increases the stability of the conjugate base and thus the acidity of the acid.

Consider the effect of substituents on the acidity: Electron-withdrawing groups (such as -NO2, -Cl) increase acidity by stabilizing the negative charge on the carboxylate ion, while electron-donating groups (such as -CH3, -OCH3) decrease acidity.

Evaluate the statement 'Carboxylic acids cannot donate protons in aqueous solutions.' This is incorrect because carboxylic acids are known to donate protons in aqueous solutions, which is a fundamental property of acids.