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Concept explainers
(a)
Interpretation:
Whether the fatty acid
Concept introduction:
A fatty acid having a long aliphatic chain with no double bond is called saturated fatty acid and a fatty acid that contains at least one double bond within the fatty acid chain is called unsaturated fatty acid. Due to the presence of a long alkyl side chain in saturated fatty acids, their packing efficiency is more than those of unsaturated fatty acids. As a result, unsaturated fatty acids possess lower melting point than saturated fatty acids. Thus, most of the saturated fatty acids are solid at room temperature.
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Answer to Problem 18.9E
The fatty acid
Explanation of Solution
The structural formula of fatty acid
Figure 1
The general name of the above fatty acid is palmitic acid. Palmitic acid has a long aliphatic chain of
The fatty acid shown in Figure 1 is a saturated fatty acid and it is solid at room temperature.
(b)
Interpretation:
Whether the fatty acid
Concept introduction:
A fatty acid having a long aliphatic chain with no double bond is called saturated fatty acid and a fatty acid that contains at least one double bond within the fatty acid chain is called unsaturated fatty acid. Due to the presence of a long alkyl side chain in saturated fatty acids, their packing efficiency is more than those of unsaturated fatty acids. As a result, unsaturated fatty acids possess lower melting point than saturated fatty acids. Thus, most of the saturated fatty acids are solid at room temperature.
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Answer to Problem 18.9E
The fatty acid
Explanation of Solution
The structural formula of fatty acid
Figure 2
The general name of the above fatty acid is lenoleic acid. The structural formula of lenoleic acid shows that there are two double bonds in the carbon chain. Therefore, lenoleic acid is an unsaturated fatty acid. The side chain in unsaturated fatty acids possess less van der Waal’s interactions between side chains of adjacent molecule. Therefore, the unsaturated fatty acid is a liquid at room temperature.
The fatty acid shown in Figure 2 is an unsaturated fatty acid and it is a liquid at room temperature.
(c)
Interpretation:
Whether the fatty acid
Concept introduction:
A fatty acid having a long aliphatic chain with no double bond is called saturated fatty acid and a fatty acid that contains at least one double bond within the fatty acid chain is called unsaturated fatty acid. Due to the presence of a long alkyl side chain in saturated fatty acids, their packing efficiency is more than those of unsaturated fatty acids. As a result, unsaturated fatty acids possess lower melting point than saturated fatty acids. Thus, most of the saturated fatty acids are solid at room temperature.
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Answer to Problem 18.9E
The fatty acid
Explanation of Solution
The structural formula of fatty acid
Figure 3
The general name of the above fatty acid is palmitolic acid. The structural formula of palmitolic acid contains double bonds within the fatty acid chain. Therefore, palmitolic acid is an unsaturated fatty acid. The side chain in unsaturated fatty acids possess less van der Waal’s interactions between side chains of adjacent molecule. Therefore, the unsaturated fatty acid is a liquid at room temperature.
The fatty acid shown in Figure 3 is an unsaturated fatty acid and it is a liquid at room temperature.
(d)
Interpretation:
Whether the fatty acid
Concept introduction:
A fatty acid having a long aliphatic chain with no double bond is called saturated fatty acid and a fatty acid that contains at least one double bond within the fatty acid chain is called unsaturated fatty acid. Due to the presence of a long alkyl side chain in saturated fatty acids, their packing efficiency is more than those of unsaturated fatty acids. As a result, unsaturated fatty acids possess lower melting point than saturated fatty acids. Thus, most of the saturated fatty acids are solid at room temperature.
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Answer to Problem 18.9E
The fatty acid
Explanation of Solution
The structural formula of fatty acid
Figure 4
The general name of the above fatty acid is lauric acid. Lauric acid has a long aliphatic chain of
The fatty acid shown in Figure 4 is a saturated fatty acid and it is a solid at room temperature.
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Chapter 18 Solutions
Chemistry for Today: General, Organic, and Biochemistry
- There are structural differences between saturated fatty acids, cis-unsaturated fatty acids, and trans-unsaturated fatty acids. • Why have some cities banned the use of trans-unsaturated fatty acids at restaurants? Trans-unsaturated fatty acids stack like unsaturated fatty acids and cost more energy to metabolize, making it substantially more dangerous to consume. Trans-unsaturated fatty acids stack like saturated fatty acids and cost more energy to metabolize, making it substantially more dangerous to consume. Trans-unsaturated fatty acids stack like saturated fatty acids and cost less energy to metabolize, making it substantially more dangerous to consume. None of the other answers are correct. O Trans-unsaturated fatty acids stack like unsaturated fatty acids and cost less energy to metabolize, making it substantially more dangerous to consume.arrow_forwardPaylbenarrow_forwardWhich of the following is a fatty acid which is a solid at room temperature? OH H. OH OHarrow_forward
- Which of the following is the correct condensed structural formula for a 10-carbon saturated fatty acid? Group of answer choices a. CH3–(CH2)8–COOH b. (CH3)9–COOH c.(CH3)10–COOH d.CH3–(CH2)10–COOH e.CH3–(CH2)3–CH=CH–(CH2)3–COOHarrow_forwardPalmitic acid is a(n) _____ fatty acid. a. monounsaturated b. waxy c. saturated d. polyunsaturatedarrow_forwardWhich of the following structures is a 20:2 (Δ11,16) fatty acid? a. CH3(CH2)9CH=CH(CH2)3CH=CH(CH2)2COOHb. CH3(CH2)2CH=CH(CH2)3CH=CH(CH2)9COOHc. CH3(CH2)10CH=CH(CH2)3CH=CHCH2COOHd. CH3CH2CH=CH(CH2)3CH=CH(CH2)10COOHarrow_forward
- + Question 19 of 23 Would you expect a saturated or an unsaturated fatty acid to have more dispersion forces between molecules of the same type, and why? A) Saturated, because they have more carboxylic acid groups. B) Saturated, because they more naturally stack, so there are more areas where dispersion forces can occur. C) Saturated, because the single carbon bonds are stronger than the double carbon bonds in unsaturated fatty acids. D) Unsaturated, because the double carbon bonds are stronger than the single carbon bonds in saturated fatty acids. E) Unsaturated, because double carbon bonds will interact with other double bonds in a strong dispersion force. acerarrow_forwardIs a fatty acid with the following structure saturated or unsaturated? CH3-CH,-CH, C-OH |3D Ωarrow_forwardThe structure of a fatty acid is shown below. HƠ a. Is this fatty acid most likely from a plant or animal source? b. How many carbon atoms are present? c. Is it a saturated or unsaturated fatty acid? If unsaturated what type? d. Is it most likely a solid or liquid at room temperature? e. Is it soluble in water?arrow_forward
- Partial hydrogenation can result in the formation of a. omega ω-3 fatty acids b. omega ω-6 fatty acids c. cis double bonds d. trans double bondsarrow_forwardfatty acid naming 1 A fatty acid contains 18 carbon atoms and has two double bonds. The first is between carbons 3 and 4 and a double bond is between carbons 7 and 8, both measured from the end of the hydrophobic chain (away from the carboxylic acid end). What do we call this type of fatty acid? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a omega 2 fatty acid b. omega 3 fatty acid omega 7 fatty acid omega 8 fatty acid omega 18 fatty acidarrow_forwardIs CH3F or CH3CH2OH more soluable in water.arrow_forward
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