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The C-2 epimer of D-glucose is
- a)D-Mannose
- b)D-Fructose
- c)D-Galactose
- d)D-Gulose
Correct answer is option 'A'. Can you explain this answer?
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The C-2 epimer of D-glucose isa)D-Mannoseb)D-Fructosec)D-Galactosed)D-...
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Mannose: C-2 epimer of Glucose. Source: Pfanstiehl, Inc. Mannose is a C-2 epimer of glucose and a sugar monomer of the aldohexose series of carbohydrates. Mannose is important in human metabolism, particularly in the proper glycosylation of native proteins.
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The C-2 epimer of D-glucose isa)D-Mannoseb)D-Fructosec)D-Galactosed)D-...
The C-2 epimer of D-glucose is D-Mannose.
Explanation:
D-glucose is an important monosaccharide and is classified as an aldohexose, meaning it has six carbon atoms and an aldehyde functional group. It exists in a cyclic form in aqueous solution, where the aldehyde group reacts with the hydroxyl group on the C-5 carbon to form a hemiacetal.
To understand the C-2 epimer of D-glucose, we need to first understand what an epimer is. An epimer is a stereoisomer that differs in the configuration at only one carbon atom. In the case of glucose, the carbon atom in question is the C-2 carbon.
D-glucose has the hydroxyl group (-OH) on the C-2 carbon positioned downwards in its cyclic form. The C-2 epimer of D-glucose, D-mannose, has the hydroxyl group on the C-2 carbon positioned upwards.
To visualize this, let's compare the structures of D-glucose and D-mannose:
D-Glucose:
- The hydroxyl group on the C-1 carbon is positioned downwards.
- The hydroxyl group on the C-2 carbon is positioned downwards.
- The hydroxyl group on the C-3 carbon is positioned upwards.
- The hydroxyl group on the C-4 carbon is positioned downwards.
- The hydroxyl group on the C-5 carbon is positioned upwards.
- The hydroxyl group on the C-6 carbon is positioned downwards.
D-Mannose:
- The hydroxyl group on the C-1 carbon is positioned downwards.
- The hydroxyl group on the C-2 carbon is positioned upwards.
- The hydroxyl group on the C-3 carbon is positioned upwards.
- The hydroxyl group on the C-4 carbon is positioned downwards.
- The hydroxyl group on the C-5 carbon is positioned upwards.
- The hydroxyl group on the C-6 carbon is positioned downwards.
Therefore, the C-2 epimer of D-glucose is D-mannose, as it differs from D-glucose in the configuration of the hydroxyl group on the C-2 carbon.
Explanation:
D-glucose is an important monosaccharide and is classified as an aldohexose, meaning it has six carbon atoms and an aldehyde functional group. It exists in a cyclic form in aqueous solution, where the aldehyde group reacts with the hydroxyl group on the C-5 carbon to form a hemiacetal.
To understand the C-2 epimer of D-glucose, we need to first understand what an epimer is. An epimer is a stereoisomer that differs in the configuration at only one carbon atom. In the case of glucose, the carbon atom in question is the C-2 carbon.
D-glucose has the hydroxyl group (-OH) on the C-2 carbon positioned downwards in its cyclic form. The C-2 epimer of D-glucose, D-mannose, has the hydroxyl group on the C-2 carbon positioned upwards.
To visualize this, let's compare the structures of D-glucose and D-mannose:
D-Glucose:
- The hydroxyl group on the C-1 carbon is positioned downwards.
- The hydroxyl group on the C-2 carbon is positioned downwards.
- The hydroxyl group on the C-3 carbon is positioned upwards.
- The hydroxyl group on the C-4 carbon is positioned downwards.
- The hydroxyl group on the C-5 carbon is positioned upwards.
- The hydroxyl group on the C-6 carbon is positioned downwards.
D-Mannose:
- The hydroxyl group on the C-1 carbon is positioned downwards.
- The hydroxyl group on the C-2 carbon is positioned upwards.
- The hydroxyl group on the C-3 carbon is positioned upwards.
- The hydroxyl group on the C-4 carbon is positioned downwards.
- The hydroxyl group on the C-5 carbon is positioned upwards.
- The hydroxyl group on the C-6 carbon is positioned downwards.
Therefore, the C-2 epimer of D-glucose is D-mannose, as it differs from D-glucose in the configuration of the hydroxyl group on the C-2 carbon.
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The C-2 epimer of D-glucose isa)D-Mannoseb)D-Fructosec)D-Galactosed)D-GuloseCorrect answer is option 'A'. Can you explain this answer?
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