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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 disaccharides is not a reducing sugar?

  1. a. maltose
  2. b. lactose
  3. c. sucrose
  4. d. no correct response

Interpretation Introduction

Interpretation: Among the given disaccharides, the one which is not a reducing sugar has to be identified.

Concept introduction: The bond formed between the OH group of hemiacetal carbon of one monosaccharide and an OH group on the other monosaccharide is called a glycosidic linkage.  Reducing sugars have one “free” hemiacetal carbon atom.

Explanation

Reason for correct option:

Sucrose is a non-reducing sugar.  The hemiacetal center (anomeric carbon) in each monosaccharide unit of sucrose is involved in the glycosidic linkage.  This results in the formation of two acetal centers.  It does not contain any “free” hemiacetal carbon atom.  Thus, it is a non-reducing sugar.

Hence, the correct option is (c).

Reason for incorrect options:

Maltose and lactose are reducing sugars...

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