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JEE Main 2026 Apr 8 Shift 2, Chemistry Q19: Carbohydrates

JEE Main2026Apr 8, Shift 2Chemistry
Q.

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

  1. A

    All monosaccharides are reducing sugars.

  2. B

    The monosaccharide units obtained from hydrolysis of oligosaccharides are always the same.

  3. C

    Starch and cellulose are typical examples of polysaccharides, which are very high molecular weight compounds of more than ten monosaccharide units.

  4. D

    Open chain and cyclic structures co-exist at equilibrium that are responsible for certain properties as in the case of D-(+)-glucose.

Solution

Examine each statement for accuracy.

Options (1), (3), (4) restate standard, correct properties of carbohydrates.

Option (2) is incorrect: oligosaccharides on hydrolysis can give the same monosaccharide (e.g. maltose two glucose units) or different monosaccharides (e.g. lactose glucose + galactose; sucrose glucose + fructose). The claim that they are always the same is false.

Concept behind this question

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