Question

CARBOHYDRATE QUESTIONS 1. What is the general term for stereoisomers that are not enantiomers? 2. What is the general term for a pair of stereoisomers that differ at one of chiral centers? 3. What was the name of the sugar derivative you synthesized in the carbohydrate lab? 4. What is the structural difference between aldose and ketose monosaccharides? 5. What is the structural difference between aldopentose and aldotriose?

Answer 1

Answer 1: Diastereomer

Answer 2: Diastereomer

Answer 4: An aldose caontains aldehyde functional group while ketose contains a ketone functional group.

H O H-C-OH HOH H-C-OH H-C-OH Ketose

Answer 5: Aldotriose have an aldehyde (an aldose) and three carbons while aldopentose have aldehyde and five carbons.

HO-C-H H-C-OH CH2OH CH2OH D-Glyceraldehyde D-Arabinose Aldose Pento se Aldop entose nose Aldoliost

6. Label the anomeric carbon in the following Haworth projection with an asterisk ). он но он 7. Classify the following monosaccharides as alpha or beta anomer. Please circle your answer. он но O OH он н он но HO он

Answer 8.

pyranose and furanose ring structures . "Pyranose" is used to refer to the pyran ring structure (6-membered ring with 5 carbons and 1 oxygen) Cyclic sugars that contain a six membered ring are called "pyranoses For five membered rings (four carbons and 1 oxygen) the structure is a furanose ring. Cyclization is reversible

Answer 9.

Answer 10.

CH2OH CHO но но но но он он CH2OH CH2OH A monosaccharide is given D configuration if the hydroxyl group is to the right of the last stereocenter in a Fischer projection, whereas L configuration is given if the OH is to the left of the last stereocenter carbon.