JEE Main · 2019 · Shift-ImediumBIO-059

Maltose on treatment with dilute HCl gives:

Biomolecules · Class 12 · JEE Main Previous Year Question

Question

Maltose on treatment with dilute \ceHCl\ce{HCl} gives:

Options
  1. a

    D - Galactose

  2. b

    D - Glucose

  3. c

    D - Glucose and D-Fructose

  4. d

    D - Fructose

Correct Answerb

D - Glucose

Detailed Solution

Step 1: Maltose Composition — Maltose is a disaccharide commonly referred to as malt sugar.

Step 2: Hydrolysis Reaction — Dilute \ceHCl\ce{HCl} serves as an acid catalyst to break the glycosidic bond by adding water across it.

Step 3: Conclusion — Maltose is composed entirely of two α-D-glucose\alpha\text{-D-glucose} units; therefore, its complete hydrolysis yields only D-glucose\text{D-glucose}.

Key Point: In contrast, sucrose yields glucose + fructose, and lactose yields glucose + galactose.

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