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Questions and Answers
What is the systematic name for a C18 fatty acid with one double bond?
What is the systematic name for a C18 fatty acid with one double bond?
- Octadecatrienoic acid
- Octadecadienoic acid
- Octadecanoic acid
- Octadecenoic acid (correct)
How is a C18 fatty acid with two double bonds denoted?
How is a C18 fatty acid with two double bonds denoted?
- 18:1 ω9
- 18:0
- Octadecanoic acid
- Octadecatrienoic acid (correct)
In the notation 18:2, what does the '2' signify?
In the notation 18:2, what does the '2' signify?
- The position of the carboxyl carbon
- The total number of carbon atoms
- The position of the double bond (correct)
- The number of methyl carbons
How is the position of a double bond represented in the notation of a fatty acid?
How is the position of a double bond represented in the notation of a fatty acid?
Which carbon atom is known as the α-carbon in a fatty acid?
Which carbon atom is known as the α-carbon in a fatty acid?
What does ω9 signify in the notation of a fatty acid?
What does ω9 signify in the notation of a fatty acid?
What is the most abundant type of lipids in nature?
What is the most abundant type of lipids in nature?
What are triglycerides esters of?
What are triglycerides esters of?
What gives rise to monoglyceride during esterification?
What gives rise to monoglyceride during esterification?
Which type of triglyceride is formed when the three fatty acids connected to glycerol are of the same type?
Which type of triglyceride is formed when the three fatty acids connected to glycerol are of the same type?
What is the main difference between fats and oils?
What is the main difference between fats and oils?
What is the specific gravity of freshly prepared fats and oils?
What is the specific gravity of freshly prepared fats and oils?
What causes the yellow color of body fat or milk fat?
What causes the yellow color of body fat or milk fat?
What chemical properties allow fats to be soluble in organic solvents like ether and benzene?
What chemical properties allow fats to be soluble in organic solvents like ether and benzene?
How is a C18 fatty acid with three double bonds denoted?
How is a C18 fatty acid with three double bonds denoted?
What is the systematic name for a C18 fatty acid with one double bond?
What is the systematic name for a C18 fatty acid with one double bond?
What does the notation 18:0 signify?
What does the notation 18:0 signify?
From which carbon atom is the position of a double bond denoted in the notation of a fatty acid?
From which carbon atom is the position of a double bond denoted in the notation of a fatty acid?
What gives rise to monoglyceride during esterification?
What gives rise to monoglyceride during esterification?
What is the position of a double bond denoted by when using the notation ω9?
What is the position of a double bond denoted by when using the notation ω9?
What are neutral fats and oils also known as?
What are neutral fats and oils also known as?
Which fatty acids are esters of glycerol in neutral fats and oils?
Which fatty acids are esters of glycerol in neutral fats and oils?
What is the main difference between simple triglycerides and mixed triglycerides?
What is the main difference between simple triglycerides and mixed triglycerides?
What is the most common fatty acid found in animal fats?
What is the most common fatty acid found in animal fats?
What makes oils different from fats in terms of physical properties?
What makes oils different from fats in terms of physical properties?
What causes the yellow color of body fat or milk fat?
What causes the yellow color of body fat or milk fat?
What gives rise to monoglyceride during the esterification process with glycerol?
What gives rise to monoglyceride during the esterification process with glycerol?
What are natural fats primarily composed of?
What are natural fats primarily composed of?
In terms of physical properties, why do fats float on water?
In terms of physical properties, why do fats float on water?
When hydrolyzed, what do fats and oils break down into?
When hydrolyzed, what do fats and oils break down into?
Study Notes
Fatty Acids
- A C18 fatty acid with one double bond is systematically named as oleic acid.
- A C18 fatty acid with two double bonds is denoted as 18:2, where '2' signifies the number of double bonds.
- The position of a double bond is represented in the notation of a fatty acid by counting the carbon atoms from the carboxyl end (Δ notation) or from the methyl end (ω notation).
- The first carbon atom in a fatty acid is known as the α-carbon.
Triglycerides
- Triglycerides are esters of glycerol.
- Monoglyceride is formed during esterification when one fatty acid is released from a triglyceride.
- A triglyceride is known as a simple triglyceride when all three fatty acids connected to glycerol are of the same type.
- Fats and oils are both triglycerides, but they differ in their physical properties.
Physical Properties
- The main difference between fats and oils is that fats are solid at room temperature, while oils are liquid.
- Fats and oils have a specific gravity of less than 1, which is why they float on water.
- The yellow color of body fat or milk fat is caused by carotenoid pigments.
- Fats are soluble in organic solvents like ether and benzene due to their non-polar nature.
Notation
- The notation 18:0 signifies a C18 fatty acid with no double bonds.
- The notation ω9 signifies that the double bond is located 9 carbon atoms from the methyl end.
- A C18 fatty acid with three double bonds is denoted as 18:3.
General
- Neutral fats and oils are also known as triglycerides.
- The most abundant type of lipids in nature is triglycerides.
- The most common fatty acid found in animal fats is oleic acid.
- Natural fats are primarily composed of triglycerides.
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Description
Test your knowledge on the systematic naming of fatty acids based on their parent hydrocarbons and the number of double bonds. Learn to differentiate between saturated and unsaturated fatty acids based on their systematic names.
