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Organic And Biological Chemistry

7th Edition
STOKER + 1 other
ISBN: 9781305081079

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Chapter
Section
BuyFindarrow_forward

Organic And Biological Chemistry

7th Edition
STOKER + 1 other
ISBN: 9781305081079
Textbook Problem

Which of the following types of monosaccharides have cyclic forms that involve a five-membered ring?

  1. a. aldopentoses and ketopentoses
  2. b. aldopentoses and ketohexoses
  3. c. aldohexoses and ketopentoses
  4. d. no correct response

Interpretation Introduction

Interpretation: The pair of monosaccharides which have cyclic forms that involve a five-membered ring has to be identified.

Concept introduction: Monosaccharides can be classified on the basis of type of carbonyl group.  There are two types of monosaccharides: aldoses and ketoses.  A monosaccharide which contains an aldehyde functional group as well as five carbon atoms is called aldopentose.  However, a monosaccharide which contains a ketone group and six carbon atoms is known as ketohexose.

Explanation

Reason for correct option:

During the cyclisation of ketoses, the number of atoms in the ring is always one less than the number of carbon atoms in the open chain form.  Therefore, ketohexoses will have five-membered ring in the cyclic form.  During the cyclisation of aldoses, the number of atoms in the ring will be equal to the number of carbon atoms in the open chain form...

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