
Concept explainers
To explain: The reason behind the sugar alcohol (monosaccharide derivatives) is no longer designated as D or L.
Introduction:
Monosaccharide having five carbons is known as pentose. The molecular formula of carbohydrate is Cn(H2O)n where n represents a whole number like 3 or higher. Monosaccharide contains various

Answer to Problem 1P
Answer: Fig.1 represents the structure of glyceraldehyde.
Pictorial representation: Fig.1 represents the structure of glyceraldehyde.
Fig.1: Structure of glyceraldehyde.
Explanation of Solution
Explanation:
Glyceraldehyde belongs to a group of monosaccharide and chemical formula for glyceraldehyde is C3H6O3. The carbonyl group present at 1st position of glyceraldehyde gets reduced into hydroxyl group. This reduction of carbonyl group results in the formation of glycerol structure. Fig.1 represents the structure of glyceraldehyde.
If the central carbon atom of a compound is bonded with four different functional groups, then the compound is said to be non-super imposable. On the basis of the arrangement of H and OH group present in chiral carbon atom, the compound is designated as D or L forms. L-form of glyceraldehyde has the -OH groups at the chiral center present far from carbonyl on the left side of the molecule. In D-form, glyceraldehyde has the -OH groups at the chiral center present far from carbonyl on the right side of the molecule. In glycerol, there is no chiral carbon is present. Thus, the sugar alcohol is no longer designated as D or L-form.
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Chapter 7 Solutions
EBK LEHNINGER PRINCIPLES OF BIOCHEMISTR
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