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Chapter 13: Q. 13.7 (page 435)

What are the functional groups and number of carbons in a ketopentose?

Short Answer

Expert verified

A ketopentose contains a ketone group and a 5carbon atom.

Step by step solution

01

Introduction

  • Ketoses are monosaccharides with a ketone institution connected to every molecule.
  • If the carbonyl institution is close to the stop of the chain, ketoses can isomerize into aldoses.
  • Fructose and ribulose are examples of ketoses.
02

Ketopentose

  • The 2-position of a pentose has a single ketone group.
  • A five-carbon monosaccharide with an aldehyde group at position 1 (aldopentose) or a ketone group at position 2 (ketopentose) (ketopentose).
03

Determine the functional group and number of carbon in ketopentose

Keto refers to a ketone group, while pentose refers to a five-carbon chain.

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Most popular questions from this chapter

Identify the disaccharide that fits each of the following descriptions:

a. not a reducing sugar

b. composed of two glucose units

c. also called milk sugar

d. hydrolysis gives glucose and fructose

What reactants are needed for photosynthesis and respiration?

For each of the following, give the monosaccharide units produced by hydrolysis, the type of glycosidic bond, and the name of the disaccharide including 伪or 尾:

D-Erythritol is70% as sweet as sucrose and contains only hydroxyl functional groups. When D-erythritol is oxidized it forms D-erythrose. Draw the Fischer projection for D-erythritol.(13.3,13.5)
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