Problem: Which of the following statements about reducing sugars are true? a) The oxidation of a reducing sugar forms a carboxylic acid sugar. b) A reducing sugar will not react with the Cu2+ in Benedict's reagent. c) D-Mannose (an aldose) is a reducing sugar. d) Reducing sugars contain ketone groups instead of aldehyde groups. e) A disaccharide with its anomeric carbons joined by the glycosidic linkage cannot be a reducing sugar.

FREE Expert Solution

Properties of reducing sugars:

  • can reduce Cu2+ (Benedict's solution)  gets oxidized to form carboxylic acid (aldose)
  • contains hemiacetal → -OH and -OR attached to same C (anomeric carbon)
    • has free aldehyde or ketone
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Problem Details

Which of the following statements about reducing sugars are true? 

a) The oxidation of a reducing sugar forms a carboxylic acid sugar. 

b) A reducing sugar will not react with the Cu2+ in Benedict's reagent. 

c) D-Mannose (an aldose) is a reducing sugar. 

d) Reducing sugars contain ketone groups instead of aldehyde groups. 

e) A disaccharide with its anomeric carbons joined by the glycosidic linkage cannot be a reducing sugar.

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