Textbook Question
How are the following pairs of carbohydrates, shown in a Fischer projection, related to each other? Are they structural isomers, enantiomers, diastereomers, or epimers? Identify each as the D- or L-isomer.
(b)
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20. Carbohydrates
D vs L Enantiomers
Multiple Choice
Identify the given molecule as diastereomer or epimer of D-sorbose.
A
Diastereomer
B
Epimer
Verified step by step guidance1
Identify the structure of the given molecule and D-sorbose from the images. Both are ketoses with the same carbon skeleton.
Compare the stereochemistry of each chiral center in the given molecule with D-sorbose. Note the orientation of the hydroxyl (OH) groups.
Determine if the molecules differ at more than one chiral center. If they do, they are diastereomers.
Check if the molecules differ at only one chiral center. If they do, they are epimers.
Conclude that the given molecule is a diastereomer of D-sorbose because they differ at more than one chiral center.
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