Which of following statement(s) are correct for Glucose?
(A) Glucose is a monosaccharide sugar
(B) Glucose is an aldohexose and is also known as dextrose.
(C) Glucose can be hydrolyzed.
(D) Glucose is a reducing sugar.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (A), (B) and (D) only
Carbohydrates are classified by their behaviour on hydrolysis. A monosaccharide cannot be hydrolysed into simpler polyhydroxy aldehydes or ketones; disaccharides and polysaccharides can. Carbohydrates that reduce Fehling’s solution and Tollens’ reagent are reducing sugars, and all monosaccharides are reducing sugars.
(A) Glucose is a monosaccharide sugar — Correct. Glucose, \( \ce{C6H12O6} \), is a single sugar unit.
(B) Glucose is an aldohexose and is also known as dextrose. — Correct. It has six carbon atoms (hexose) and an aldehyde group (aldo-), and its common name is dextrose.
(C) Glucose can be hydrolyzed. — Incorrect. As a monosaccharide, glucose cannot be hydrolysed further. It is a product of hydrolysis, for example of sucrose or starch.
(D) Glucose is a reducing sugar. — Correct. Its free aldehyde group (in the open-chain form) reduces Tollens’ reagent and Fehling’s solution.
NCERT (2026-27 edition):
Classification of Carbohydrates – “… (i) Monosaccharides: A carbohydrate that cannot be hydrolysed further to give simpler unit of polyhydroxy aldehyde or ketone is called a monosaccharide. About 20 monosaccharides are known to occur in nature. Some common examples are glucose, fructose, ribose, etc.”
Classification of Carbohydrates – “… The carbohydrates may also be classified as either reducing or non- reducing sugars. All those carbohydrates which reduce Fehling’s solution and Tollens’ reagent are referred to as reducing sugars. All monosaccharides whether aldose or ketose are reducing sugars.”