Which of the following is known as reducing sugar?
A
Monosaccharide
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B
Oligosaccharide
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C
Polysaccharide
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D
All of the above
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Solution
The correct option is A Monosaccharide
A reducing sugar has a free aldehyde group or a free ketone group so it can act as reducing agent.
Monosaccharides are the simplest carbohydrates. They cannot be hydrolyzed into smaller units. These sugars contain a free aldehyde or ketone group. The anomeric carbon of the reducing sugar has OH group. For example, glucose and fructose.