Concept explainers
(a)
Interpretation:
Structure of an aldotetrose has to be drawn.
Concept Introduction:
Simplest carbohydrates are known as monosaccharides. They contain three to six carbons generally in a chain form with a carbonyl group present in the terminal or the adjacent carbon atom from the terminal. Monosaccharides that have the carbonyl group at the terminal carbon atom
The number of carbon atoms present in the chain characterize the monosaccharide. They are given below.
- Carbon chain with three carbon atoms is triose.
- Carbon chain with four carbon atoms is tetrose.
- Carbon chain with five carbon atoms is as pentose.
- Carbon chain with six carbon atoms is as hexose.
(b)
Interpretation:
Structure of a ketopentose has to be drawn.
Concept Introduction:
Refer part (a).
(c)
Interpretation:
Structure of an aldohexose has to be drawn.
Concept Introduction:
Refer part (a).
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Principles of General, Organic, Biological Chemistry
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- Lactose is a disaccharide in which a glycosidic linkage connects the monosaccharides galactose and glucose. OH НО OH (a) Identify the glycosidic linkage and the acetal carbon in lactose. (b) What type of glycosidic linkage does lactose have (i.e., is it 1,1'-, 1,2'-, etc., and is it a or B)? (c) People who are lactose intolerant are deficient in the enzyme lactase, and therefore cannot efficiently break down the disaccharide into its monosaccharides. When lactose is treated with aqueous acid, however, this hydrolysis can take place, though relatively slowly. Draw the complete, detailed mechanism and the products of the acid-catalyzed hydrolysis of lactose. Но ОН НО ОН ОН Lactosearrow_forwardWhat chemical test should be used to distinguish allose and maltose?arrow_forward
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