Question 69

The incorrect statement from the following with respect to carbohydrates is :

Solution

Statement A is correct: All monosaccharides (whether aldoses or ketoses) are reducing sugars because they possess a free or potentially free aldehyde or ketone group that can reduce Tollen's or Fehling's reagents.

Statement B is incorrect: Oligosaccharides can yield different types of monosaccharides upon hydrolysis. For example, Sucrose (a disaccharide) hydrolyzes to give one molecule of glucose and one molecule of fructose, which are different units.

Statement C is correct: Polysaccharides like starch and cellulose are high molecular weight polymers consisting of hundreds to thousands of monosaccharide units.

Statement D is correct: In aqueous solution, sugars like D-glucose exist in an equilibrium between their open-chain form and their cyclic $$\alpha\ and\ \beta\ $$ anomers.

Therefore, Option B is Correct

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