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

32. Lipids

Physical Properties of Fatty Acids

Organic Chemistry

32. Lipids

Physical Properties of Fatty Acids

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Multiple Choice

A triglyceride or triacylglycerol represents a glycerol molecule that has bonded to 3 fatty acid chains. Based on the following descriptions, which of the following would be the most soluble in an aqueous solution?

A triglyceride composed of 1 glycerol molecule + 3 lauric acid chains.

A triglyceride composed of 1 glycerol molecule + 2 stearic acid chains + 1 lauric acid chain.

A triglyceride composed of 1 glycerol molecule + 3 arachidic acid chains.

A triglyceride composed of 1 glycerol molecule + 2 myristic acid chains + 1 lauric acid chain.

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Verified step by step guidance

Understand that triglycerides are composed of a glycerol backbone bonded to three fatty acid chains. The solubility of a triglyceride in water is influenced by the length and saturation of these fatty acid chains.

Recognize that shorter fatty acid chains and the presence of unsaturation (double bonds) generally increase solubility in water due to decreased hydrophobic interactions.

Identify the fatty acids mentioned: lauric acid (12 carbons), myristic acid (14 carbons), stearic acid (18 carbons), and arachidic acid (20 carbons). Lauric acid has the shortest chain, which suggests it would contribute to higher solubility.

Compare the triglycerides: A triglyceride with three lauric acid chains would have the shortest overall chain length, making it more likely to be soluble in water compared to those with longer chains like stearic or arachidic acids.

Conclude that the triglyceride composed of 1 glycerol molecule and 3 lauric acid chains is the most soluble in an aqueous solution due to the shorter chain length of lauric acid, which reduces hydrophobic interactions.