Concept explainers
(a)
Interpretation: The given compound is to be classified as reducing or nonreducing sugar.
Concept introduction: A carbohydrate that contains hemiacetal is classified as reducing sugar whereas a carbohydrate which contains acetal is classified as nonreducing sugar. The reducing sugars are in equilibrium with an acyclic
(b)
Interpretation: The given compound is to be classified as reducing or nonreducing sugar.
Concept introduction: A carbohydrate that contains hemiacetal is classified as reducing sugar whereas a carbohydrate which contains acetal is classified as nonreducing sugar. The reducing sugars are in equilibrium with an acyclic aldehyde.
(c)
Interpretation: The given compound is to be classified as reducing or nonreducing sugar.
Concept introduction: A carbohydrate that contains hemiacetal is classified as reducing sugar whereas a carbohydrate which contains acetal is classified as nonreducing sugar. The reducing sugars are in equilibrium with an acyclic aldehyde.
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Chapter 28 Solutions
Organic Chemistry
- a. How many stereogenic centers are present in α-D-galactose? b. Label the hemiacetal carbon in α-D-galactose. c. Draw the structure of β-D-galactose. d. Draw the structure of the polyhydroxy aldehyde that cyclizes to α- and β-D-galactose.arrow_forwarda) Draw Haworth projections of both - and -anomers of D-fructose. Indicate which carbon is the anomeric carbon.b) Sucrose is a disaccharide made up of a molecule of D-fructose and D-glucose. Draw the structure of sucrose clearly indicating the linkage between the two monosaccharides and its biological significance.c) Tollen’s reagent is a very mild oxidizing agent which normally oxidize aldehydes but not ketones. However, both glucose and fructose give positive results with Tollen’s reagent and are classified as reducing sugars. Explain how fructose can also give positive results with Tollen’s reagent (illustrate using structures).arrow_forwardD-Arabinose can exist in both pyranose and furanose forms. a. Draw the α and β anomers of D-arabinofuranose. b. Draw the α and β anomers of D-arabinopyranose.arrow_forward
- Using the cyclic structure (Haworth Formula) of sucrose, encircle the acetal link and explain why it is a non reducing sugar. explain do not copy from google,,,pls type answer if u canarrow_forwarda. Differentiate Benedict’s test from Barfoed’s test. b. Arrange the following sugars according to their DECREASING reactivity with Benedict’s reagent. [fructose, starch, maltose, sucrose, glucose]arrow_forwardSuggest how you could distinguish a sample of glucose from a sample of maltose using Benedict’s reagent. [Hint: maltose is a disaccharide reducing sugar].arrow_forward
- a. Identify the glycosidic linkage in disaccharide C, classify the glycosidic bond as α or β, and use numbers to designate its location.b. Identify the lettered compounds in the following reaction.arrow_forwardDraw the product formed when each monosaccharide is oxidized with Benedict’s reagent.arrow_forwardClassify the following monosaccharide. a. alpha pyranose b. alpha furanose c. beta pyranose d. deoxy pyranose e. beta furanosearrow_forward
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