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Chapter 13: Q. 13.28 (page 446)

D-Fructose is the sweetest monosaccharide. How does the Fischer projection of D-fructose differ from that of D-glucose?

Short Answer

Expert verified

D-glucose is an aldohexose, whereasD-fructose is a ketohexose.

Step by step solution

01

Introduction

In this task, we must describe the structural difference betweenD-fructose and D-glucose (in Fischer projections).

02

Explanation

  • Aldohexose and ketohexose, for example, are monosaccharides with six carbons.
  • The aldehyde group is present in aldohexoses, whereas the ketone group is present in ketohexoses.
  • D-fructose, a ketohexose, andD-glucose, an aldohexose, are the sugars in this example.
03

Draw the of  D-fructose from D-glucose. 

  • This indicates that the distinction is between the first two carbons, which contain carbonyl groups (marked in blue in the Figure below).
  • D-glucose has four stereogenic centres and an aldehyde group, whereas D-fructose has three stereogenic centres and a ketone group.
  • The rest of the molecule is identical except for the first two carbons.

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