Multiple Choice
Which sugar is an enantiomer of sugar A? How many stereoisomers does sugar A have?
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9. Carbohydrates
Stereochemistry of Monosaccharides
Multiple Choice
Which term best describes the relationship between D-Mannose & L-Mannose?
A
Enantiomers.
B
Anomers.
C
Epimers.
D
Diastereomers.
E
Same molecules
Verified step by step guidance1
Begin by examining the structures of D-Mannose and L-Mannose. Notice that they are mirror images of each other.
Understand that enantiomers are pairs of molecules that are non-superimposable mirror images of each other. This is a key characteristic of D and L forms of sugars.
Identify the chiral centers in both D-Mannose and L-Mannose. Each carbon atom that is bonded to four different groups is a chiral center.
Count the number of chiral centers in both molecules. D-Mannose and L-Mannose have the same number of chiral centers, and their configurations are opposite at each chiral center.
Conclude that the relationship between D-Mannose and L-Mannose is that of enantiomers, as they are mirror images with opposite configurations at all chiral centers.
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