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Question

Which of the following is incorrect regarding maltose?

A
It consists of two glucopyranose units
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B
It is a non-reducing sugar
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C
Glycosidic bond between C1 of one unit and C4 of the other unit
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D
It is a disaccharide
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Solution

The correct option is B It is a non-reducing sugar
Maltose is a dissacharide. Hydrolysis of maltose gives two monomers of glucose.
C12H22O11Hydrolysis−−−−−C6H12O6 + C6H12O6 Maltose αDGlucose αDGlucose

The free aldehyde group can be produced at the C1 carbon of the second α-D-glucose unit in solution and it shows reducing properties. Hence, it is a reducing sugar.
Glycosidic bond between C1 of one unit and C4 of the other unit

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