Question

Carbohydrates that produce two to ten monosaccharides units during the hydrolysis are called

• A. Oligosaccharides
• B. Aldoses
• C. Ketoses
• D. Polyhydroxy aldehyde

Hint:

Carbohydrate classification by hydrolysis products:
Mono- (1 unit)
Oligo- (2-10 units)
Poly- (>10 units) Aldoses and ketoses refer to the type of carbonyl group in a monosaccharide.

Answer 1

The Correct Option is A

Carbohydrates are classified based on the number of simpler sugar units (monosaccharides) they can be broken down into through hydrolysis (reaction with water).
Monosaccharides: The simplest carbohydrates; they cannot be hydrolyzed into smaller sugar units (e.g., glucose, fructose).
Oligosaccharides: Carbohydrates that yield 2 to 10 monosaccharide units upon hydrolysis. This category includes disaccharides (yielding 2 units, like sucrose) and others like trisaccharides (3 units, e.g., raffinose).
Polysaccharides: Carbohydrates that yield many (more than 10, often hundreds or thousands) monosaccharide units upon hydrolysis (e.g., starch, cellulose). The question specifically asks for carbohydrates that produce two to ten monosaccharide units upon hydrolysis. This definition directly matches oligosaccharides. The other options are different classifications:
Aldoses: Monosaccharides containing an aldehyde (-CHO) functional group (e.g., glucose).
Ketoses: Monosaccharides containing a ketone (C=O) functional group (e.g., fructose).
Polyhydroxy aldehyde: This is a chemical description of an aldose – a molecule with multiple hydroxyl (-OH) groups and an aldehyde group. Thus, the correct answer is (1) Oligosaccharides. Oligosaccharides