Domanda del libro di testo
Which of these fatty acids has the lower melting point? Explain why.
a. Linoleic acid
b. Stearic acid
544
views
Ch.23 Lipids
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187
Non è quello che usi tu?Cambia libro di testoScegli un libro di testo diverso
TOC.tableOfContents
- Ch.1 Matter and Measurements27
- Ch.2 Atoms and the Periodic Table20
- Ch.3 Ionic Compounds8
- Ch.4 Molecular Compounds23
- Ch.5 Classification & Balancing of Chemical Reactions12
- Ch.6 Chemical Reactions: Mole and Mass Relationships28
- Ch.7 Chemical Reactions: Energy, Rate and Equilibrium64
- Ch.8 Gases, Liquids and Solids24
- Ch.9 Solutions52
- Ch.10 Acids and Bases25
- Ch.11 Nuclear Chemistry22
- Ch.12 Introduction to Organic Chemistry: Alkanes57
- Ch.13 Alkenes, Alkynes, and Aromatic Compounds47
- Ch.14 Some Compounds with Oxygen, Sulfur, or a Halogen50
- Ch.15 Aldehydes and Ketones45
- Ch.16 Amines42
- Ch.17 Carboxylic Acids and Their Derivatives57
- Ch.18 Amino Acids and Proteins82
- Ch.19 Enzymes and Vitamins63
- Ch.20 Carbohydrates44
- Ch.21 The Generation of Biochemical Energy65
- Ch.22 Carbohydrate Metabolism45
- Ch.23 Lipids42
- Ch.24 Lipid Metabolism33
- Ch.25 Protein and Amino Acid Metabolism24
- Ch.26 Nucleic Acids and Protein Synthesis45
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187Non è quello che usi tu?Cambia libro di testo
Capitolo 23, Problema 29
Draw an 18-carbon unsaturated fatty acid that contains two carbon–carbon double bonds, one on carbon 6 and one on carbon 9 (count starting with the carboxyl carbon). Is this a “straight-chain” molecule or a “bent” molecule?
Guida verificata passo dopo passo1
Step 1: Begin by understanding the structure of a fatty acid. A fatty acid consists of a carboxyl group (-COOH) at one end and a long hydrocarbon chain. In this case, the chain contains 18 carbons.
Step 2: Identify the positions of the double bonds. The problem specifies that there are two carbon–carbon double bonds: one at carbon 6 and one at carbon 9. Number the carbon atoms starting from the carboxyl carbon (carbon 1).
Step 3: Draw the hydrocarbon chain with single bonds between carbons initially. Then, introduce the double bonds at the specified positions: between carbon 6 and carbon 7, and between carbon 9 and carbon 10. Ensure the rest of the carbons are connected by single bonds.
Step 4: Determine the geometry around the double bonds. Carbon–carbon double bonds in fatty acids typically have a cis configuration, which causes a bend in the molecule at each double bond. Draw the chain with bends at the positions of the double bonds to reflect this geometry.
Step 5: Conclude whether the molecule is 'straight-chain' or 'bent.' Since the cis double bonds introduce bends in the structure, this molecule is not a straight-chain molecule but a bent one.
Risposta video verificata per un problema simile:
Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
3mConcetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
Fatty Acid Structure
Fatty acids are carboxylic acids with long hydrocarbon chains. The structure includes a carboxyl group (-COOH) at one end, followed by a chain of carbon atoms. In unsaturated fatty acids, one or more double bonds exist between carbon atoms, affecting the molecule's shape and properties.
Video consigliato:
Percorso guidato
0:55
Fatty Acids Example 1
Unsaturation and Double Bonds
Unsaturation refers to the presence of double bonds in a fatty acid chain. Each double bond introduces a kink in the chain, preventing tight packing of the molecules. In this case, the presence of two double bonds at specific positions (carbon 6 and carbon 9) indicates that the fatty acid is unsaturated and will have a bent shape.
Video consigliato:
Percorso guidato
3:27DNA Double Helix Concept 1
Molecular Geometry
Molecular geometry describes the three-dimensional arrangement of atoms in a molecule. In the case of fatty acids, the presence of double bonds leads to a bent or kinked structure, as opposed to a straight-chain configuration. This geometric difference influences the physical properties of the fatty acid, such as melting point and fluidity.
Video consigliato:
Percorso guidato
01:30Molecular Geometry (Simplified) Concept 1
Pratica correlata
Domanda del libro di testo
Complete hydrogenation of triacylglycerol C in Problem 23.20 yields a triacylglycerol of what fatty acid composition? Would the hydrogenation product of triacylglycerol C be more like the hydrogenation product of triacylglycerol A or B? Explain.
927
views
Domanda del libro di testo
Which of these fatty acids has the higher melting point? Explain why.
a. Linolenic acid
b. Stearic acid
809
views
Domanda del libro di testo
A membrane lipid was isolated and completely hydrolyzed. The following products were detected: ethanolamine, phosphate, glycerol, palmitic acid, and oleic acid. Propose a structure for this membrane lipid, and name the family to which it belongs.
768
views
Domanda del libro di testo
Are the carbon–carbon double bonds in naturally occurring fatty acids primarily cis or trans?
1491
views
Domanda del libro di testo
Draw an 18-carbon saturated fatty acid. Is this a “straight-chain” molecule or a “bent” molecule?
930
views