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Biomolecules question

2021 · 27 Aug · Shift 2 · Q11
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Biomolecules question

2021 · 27 Aug · Shift 2 · Q11

JEE MainChemistryBiomoleculesMCQ+4 / −1
Hydrolysis of sucrose gives :
  1. A
    α\alphaα-D-(−-−)-Glucose and β\betaβ-D-(−-−)-Fructose
  2. B
    α\alphaα-D-(+)-Glucose and α\alphaα-D-(−-−)-Fructose
  3. C
    α\alphaα-D-(−-−)-Glucose and α\alphaα-D-(+)-Fructose
  4. D
    α\alphaα-D-(+)-Glucose and β\betaβ-D-(−-−)-Fructose
View written solutionFree

Correct answer: D

  1. Identify what sucrose is made of

    Sucrose is a disaccharide composed of: α-D-(+)-glucoseandβ-D-(-)-fructose\alpha\text{-D-(+)-glucose} \quad \text{and} \quad \beta\text{-D-(-)-fructose}α-D-(+)-glucoseandβ-D-(-)-fructose

    These two units are linked through an α,β\alpha,\betaα,β-glycosidic bond.

  2. What happens on hydrolysis?

    On hydrolysis, sucrose breaks into its constituent monosaccharides: sucrose+H2O→glucose+fructose\text{sucrose} + H_2O \rightarrow \text{glucose} + \text{fructose}sucrose+H2​O→glucose+fructose

  3. Nature of the products obtained

    The hydrolysis products are:

    • α\alphaα-D-(+)-Glucose
    • β\betaβ-D-(-)-Fructose
  4. Check the options

    • A: α\alphaα-D-(−-−)-Glucose and β\betaβ-D-(−-−)-Fructose
      Wrong, because glucose is dextrorotatory, i.e. (+)(+)(+).

    • B: α\alphaα-D-(+)-Glucose and α\alphaα-D-(−-−)-Fructose
      Wrong, because fructose unit in sucrose is β\betaβ form.

    • C: α\alphaα-D-(−-−)-Glucose and α\alphaα-D-(+)-Fructose
      Wrong, both signs/forms are incorrect.

    • D: α\alphaα-D-(+)-Glucose and β\betaβ-D-(−-−)-Fructose
      Correct.

  5. Final answer

    Therefore, hydrolysis of sucrose gives: α-D-(+)-Glucose and β-D-(-)-Fructose\alpha\text{-D-(+)-Glucose and }\beta\text{-D-(-)-Fructose}α-D-(+)-Glucose and β-D-(-)-Fructose

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