JEE Main 2026 — Biomolecules Question with Solution
JEE Main 2026 (08 April Shift 2)
Question
The incorrect statement from the following with respect to carbohydrates is:
Choose an option
Show full solutionCorrect option: B
Correct answer
BThe monosaccharide units obtained from hydrolysis of oligosaccharides are always the same.
Step-by-step explanation
Statement (A) is correct because all monosaccharides contain a free aldehyde or ketonic group (or exist in equilibrium with it) and act as reducing sugars.
Statement (B) is incorrect because the hydrolysis of oligosaccharides can yield either the same or different monosaccharide units. For example, sucrose is an oligosaccharide (disaccharide) that yields one molecule of glucose and one molecule of fructose upon hydrolysis, whereas maltose yields two molecules of glucose.
Statement (C) is correct as polysaccharides like starch and cellulose are high molecular weight polymers containing more than ten monosaccharide units.
Statement (D) is correct because in an aqueous solution, -glucose exists in an equilibrium between its open-chain form and its cyclic hemiacetal forms ( and anomers), which explains its mutarotation and other properties.
Answer: The monosaccharide units obtained from hydrolysis of oligosaccharides are always the same.
Statement (B) is incorrect because the hydrolysis of oligosaccharides can yield either the same or different monosaccharide units. For example, sucrose is an oligosaccharide (disaccharide) that yields one molecule of glucose and one molecule of fructose upon hydrolysis, whereas maltose yields two molecules of glucose.
Statement (C) is correct as polysaccharides like starch and cellulose are high molecular weight polymers containing more than ten monosaccharide units.
Statement (D) is correct because in an aqueous solution, -glucose exists in an equilibrium between its open-chain form and its cyclic hemiacetal forms ( and anomers), which explains its mutarotation and other properties.
Answer: The monosaccharide units obtained from hydrolysis of oligosaccharides are always the same.
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This is a previous-year question from JEE Main 2026, covering the Biomolecules chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.