Concept explainers
(a)
Interpretation: The given compounds A, B and C are to be labeled as D or L-sugar.
Concept introduction: A sugar molecule in which hydroxyl group of second last carbon atom is on the left and right side of the horizontal line is known as
(b)
Interpretation: The relation between A and B, A and C, B and C is to be determined from enantiomers, diastereomers and constitutional isomers.
Concept introduction: Two compounds which are non-superimposable mirror images of each other are known as enantiomers. Whereas two compounds which are neither superimposable nor mirror images to each other are known as diastereomer. On the other hand, two compounds that have same molecular formula but different structural arrangement of atoms are known as constitutional isomers.
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ORG.CHEMISTRY W/ACCESS+MODEL KIT PKG
- Draw the following monosaccharides, using chair conformations for the pyranoses andHaworth projections for the furanoses.(a) a-d-mannopyranose (C2 epimer of glucose)(b) b-d-galactopyranose (C4 epimer of glucose)(c) b-d-allopyranose (C3 epimer of glucose)(d) a-d-arabinofuranose(e) b-d-ribofuranose (C2 epimer of arabinose)arrow_forwardAnswer the following questions about the eight aldopentoses: a. Which are enantiomers? b. Which are C-2 epimers? c. Which form an optically active compound when oxidized with nitric acid?arrow_forwardDraw a chair conformation for the b-anomer of a disaccharide in which two units of d-glucopyranose are joined by an a-1,6-glycosidic bond.arrow_forward
- For D-arabinose:a. Draw its enantiomer.b. Draw an epimer at C3.c. Draw a diastereomer that is not an epimer.d. Draw a constitutional isomer that still contains a carbonyl group.arrow_forwardAs we have seen in monosaccharides can be drawn in avariety of ways, and in truth, often a mixture of cyclic compounds ispresent in a solution. Identify each monosaccharide, including its properD,L designation, drawn in a less-than-typical fashion.arrow_forwardWithout referring to the chapter, draw the chair conformations of(a) b-d-mannopyranose (the C2 epimer of glucose).(b) a-d-allopyranose (the C3 epimer of glucose).(c) b-d-galactopyranose (the C4 epimer of glucose)arrow_forward