Concept explainers
(a)
Interpretation: The structure of ketotetrose is to be drawn.
Concept introduction: A monosaccharide in which
Answer to Problem 28.1P
The structure of ketotetrose is,
Figure 1
Explanation of Solution
The name ketotetrose suggests that it is a monosaccharide that contains four carbon atoms and a ketone group. The ketone carbonyl group is present on second carbon atom in ketoses. The structure of ketotetrose is shown in Figure 1.
Figure 1
The structure of ketotetrose is shown in Figure 1.
(b)
Interpretation: The structure of aldopentose is to be drawn.
Concept introduction: A monosaccharide in which aldehyde carbonyl group is present at
Answer to Problem 28.1P
The structure of aldopentose is,
Figure 2
Explanation of Solution
The name aldopentose suggests that it is a monosaccharide that contains five carbon atoms and an aldehyde group. The aldehyde carbonyl group is present on first carbon atom in aldoses. The structure of aldopentose is shown in Figure 2.
Figure 2
The structure of aldopentose is shown in Figure 2.
(c)
Interpretation: The structure of aldotetrose is to be drawn.
Concept introduction: A monosaccharide in which aldehyde carbonyl group is present at
Answer to Problem 28.1P
The structure of aldotetrose is,
Figure 3
Explanation of Solution
The name aldotetrose suggests that it is a monosaccharide that contains four carbon atoms and an aldehyde group. The aldehyde carbonyl group is present on first carbon atom in aldoses. The structure of aldotetrose is shown in Figure 3.
Figure 3
The structure of aldotetrose is shown in Figure 3.
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Chapter 28 Solutions
Organic Chemistry
- Draw the structure of: (a) a polysaccharide formed by joining D-mannose units in 1->4-ß-glycosidic linkages; (b) a polysaccharide formed by joining D-glucose units in 1->6-a-glycosidic linkages. The polysaccharide in (b) is dextran, a component of dental plaque.arrow_forwardA) Define "reducing sugar." (b) Sucrose is a disaccharide composed of glucose and fructose (Glc(1 → 2)Fru). Explain why sucrose is not a reducing sugar, even though both glucose and fructose are.arrow_forwardWhich statement about saccharides is correct? (A). Alpha anomers are more common than beta anoomers. (B). Two monosaccharides can form a disaccharide and oxygen. (C). Polysaccharides with alpha or beta glycosidic linkages have the different properties. (D). Disaccharides can be cyclic or acyclic.arrow_forward
- Monosaccharides can be categorized in terms of thenumber of carbon atoms (pentoses have five carbons andhexoses have six carbons) and according to whether theycontain an aldehyde (aldo- prefix, as in aldopentose) orketone group (keto- prefix, as in ketopentose). Classify glucoseand fructose in this way.arrow_forwardIndicate whether each statement is true or false: (a)Disaccharides are a type of carbohydrate. (b) Sucrose is amonosaccharide. (c) All carbohydrates have the formulaCnH2mOm.arrow_forwardIf a monosaccharide is represented by a single blue sphere, which of the following representations corresponds to (a) lactose; (b) cellulose; (c) amylopectin?arrow_forward
- Suggest 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_forwardIndicate whether each statement is true or false: (a) Disaccharides are a type of carbohydrate. (b) Sucrose is a monosaccharide. (c) All carbohydrates have the formula CnH2mOm.arrow_forward
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