Which of the following represents a pair of epimers? A Н- Н- OH с -OH H-C-OH H-C-H OH О C-H H-C-OH Н- O= он -H HO- -c-H H-C-OH H- C-H OH 0 C-H НО-С-Н H-C-OH H-C-OH НО-С-Н НО-С-Н H-C-OH НО-С-Н H-C-OH НО-С-Н CH.OH CH₂OH В н :0 D H-C-OH НО-c-Н H-C-OH HO-C-H H-C-OH но-с-н H-C-OH CH, OH Н-С=0 но-он Н FO H-H Н-С=0 CO H-C-OH CH OH H-C=0 HO-OH 0= H—H H-C=O
Which of the following represents a pair of epimers? A Н- Н- OH с -OH H-C-OH H-C-H OH О C-H H-C-OH Н- O= он -H HO- -c-H H-C-OH H- C-H OH 0 C-H НО-С-Н H-C-OH H-C-OH НО-С-Н НО-С-Н H-C-OH НО-С-Н H-C-OH НО-С-Н CH.OH CH₂OH В н :0 D H-C-OH НО-c-Н H-C-OH HO-C-H H-C-OH но-с-н H-C-OH CH, OH Н-С=0 но-он Н FO H-H Н-С=0 CO H-C-OH CH OH H-C=0 HO-OH 0= H—H H-C=O
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:The image shows a question related to organic chemistry, specifically focusing on the concept of epimers. The question is: "Which of the following represents a pair of epimers?"
Here are the details of each option:
- **Option A:**
- Two structures are shown with vertical chains.
- Both structures have a carbon backbone with hydroxyl (OH) groups and a carbonyl group.
- **Option B:**
- Two structures are shown with vertical chains.
- Both molecules have five carbon atoms, hydroxyl (OH) groups, and a terminal aldehyde (CHO) group.
- **Option C:**
- Two structures, each with six carbon atoms.
- Both contain multiple hydroxyl (OH) groups and a terminal aldehyde (CHO) group.
- **Option D:**
- Two simple structures with two carbon atoms each.
- Contains terminal aldehyde (CHO) groups on both ends.
### Diagram Explanation:
- **Option A and D** seem to illustrate simple linear carbon chains with specific functional groups (hydroxyl and carbonyl), but the changes in stereochemistry are not immediately clear.
- **Option B and C** illustrate structures that represent carbohydrates with more complex stereochemistry, where the orientation of one hydroxyl group differs between the two molecules.
**Focus on 'Epimers':** Epimers are monosaccharides that differ in configuration at only one stereogenic center. In context, option B shows two carbohydrate-like molecules that differ at just one carbon, making them epimers.
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