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What is The monsaccharide glucose is best described by which one of the following  statements? and explain in detail?
Two monosaccharide units are linked by a glycosidic bond or yield 2 monosaccharide units on hydrolysis. Depending on their reducing property, they are divided into:

Nonreducing disaccharides: The functional groups are involved in the glycosidic bond formation, hence free functional groups are not available
Reducing disaccharides: Free functional groups are available.

Key Concept:

Glucose forms part of sucrose and is attached to fructose to form disaccharide i.e.,sucrose.