Concept explainers
(a)
Interpretation:
The skeletal structure of the given fatty acid should be drawn and cis-double bond is to be indicated.
Concept Introduction:
Fatty acids are long-chain
Unsaturated fatty acids can be defined as the long-chain fatty acids which have a long hydrocarbon chain with −COOH group. In unsaturated fatty acids, the carbon chain must have at least one double bond.
Answer to Problem 33P
Explanation of Solution
Given:
Fatty acids are long-chain carboxylic acids, which consist of two parts; long hydrocarbon chains and polar −COOH group. The long hydrocarbon chain consists of carbon and H atoms, so it has C-C and C-H bonds only, whereas, the polar −COOH group has polar C=O and C-O bonds. The unsaturated fatty acids have cis and trans-double bonds in the hydrocarbon chain.
In the ball-and-stick model, the red ball represents O atom, black ball represents C atom and white ball represents H atoms. Thus, the skeletal structure is:
(b)
Interpretation:
The omega-n designation for the
Concept Introduction:
Fatty acids are long-chain carboxylic acid, which may or may not have unsaturation in the molecule. They react with glycerol to form triglycerides. The reaction is called esterification as a carboxylic acid group reacts with the alcoholic group to form an ester group.
Unsaturated fatty acids can be defined as the long-chain fatty acids which have a long hydrocarbon chain with −COOH group. In unsaturated fatty acids, the carbon chain must have at least one double bond.
Answer to Problem 33P
The
Explanation of Solution
Fatty acids are long-chain carboxylic acids, which consist of two parts; long hydrocarbon chains and polar −COOH group. If there is at least one double bond in the long hydrocarbon chain of the fatty acid it is said to be an unsaturated fatty acid.
The unsaturated fatty acids can also classify as omega-n acids. Here, 'n' represents the position of the first
In the given fatty acid, the first
(c)
Interpretation:
The stereoisomer of the
Concept Introduction:
Fatty acids are long-chain carboxylic acid, which may or may not have unsaturation in the molecule. They react with glycerol to form triglycerides. The reaction is called esterification as a carboxylic acid group reacts with the alcoholic group to form an ester group.
Unsaturated fatty acids can be defined as the long-chain fatty acids which have a long hydrocarbon chain with −COOH group. In unsaturated fatty acids, the carbon chain must have at least one double bond.
Answer to Problem 33P
The stereoisomer of cis-fatty acid must be trans-isomer as given below;
Explanation of Solution
Fatty acids are long-chain carboxylic acids, which consist of two parts; long hydrocarbon chains and polar −COOH group. The double bond can arrange in two ways, i.e., cis and trans in the hydrocarbon chain of the fatty acid molecule. Hence, the stereoisomer of cis-fatty acid
(d)
Interpretation:
The structure of wax formed by the reaction of
Concept Introduction:
Fatty acids are long-chain carboxylic acid, which may or may not have unsaturation in the molecule. They react with glycerol to form triglycerides. The reaction is called esterification as a carboxylic acid group reacts with the alcoholic group to form an ester group.
Unsaturated fatty acids can be defined as the long-chain fatty acids which have a long hydrocarbon chain with −COOH group. In unsaturated fatty acids, the carbon chain must have at least one double bond.
Answer to Problem 33P
The skeleton formula of wax formed by the reaction of
Explanation of Solution
Fatty acids are long-chain carboxylic acids, which consist of two parts; long hydrocarbon chains and polar −COOH group. Waxes are a good example of hydrolyzable lipids, which are composed of fatty acid and higher alcohols. They have an ester
Hence, the reaction of
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Chapter 19 Solutions
CONNECT IA GENERAL ORGANIC&BIO CHEMISTRY
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