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Question

Which one of the following is a reducing sugar?

A
Glucose
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B
Starch
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C
Cellulose
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D
Sucrose
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Solution

The correct option is B Glucose
  • Glucose has a free aldehyde group which can be oxidized to the acidic groups. Hence, glucose is a reducing sugar. Starch and Cellulose are polysaccharides.
  • They are comprised of multiple units of glucose linked together. The glucose in starch and cellulose does not contain a free aldehyde group and hence, starch and cellulose do not act as reducing sugars.
  • Similarly, sucrose is a disaccharide in which the aldehyde group of glucose is used up in forming a bond between glucose and fructose.
  • Hence, sucrose is also not a reducing sugar.

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