JEE Main · 2021 · Shift-IImediumBIO-043

Hydrolysis of sucrose gives:

Biomolecules · Class 12 · JEE Main Previous Year Question

Question

Hydrolysis of sucrose gives:

Options
  1. a

    α-D-(-)-Glucose\alpha\text{-D-(-)-Glucose} and β-D-(-)-Fructose\beta\text{-D-(-)-Fructose}

  2. b

    α-D-(+)-Glucose\alpha\text{-D-(+)-Glucose} and α-D-(-)-Fructose\alpha\text{-D-(-)-Fructose}

  3. c

    α-D-(-)-Glucose\alpha\text{-D-(-)-Glucose} and α-D-(+)-Fructose\alpha\text{-D-(+)-Fructose}

  4. d

    α-D-(+)-Glucose\alpha\text{-D-(+)-Glucose} and β-D-(-)-Fructose\beta\text{-D-(-)-Fructose}

Correct Answerd

α-D-(+)-Glucose\alpha\text{-D-(+)-Glucose} and β-D-(-)-Fructose\beta\text{-D-(-)-Fructose}

Detailed Solution

Step 1: Sucrose Components — Sucrose is a disaccharide formed by the condensation of one unit of D-glucose\text{D-glucose} and one unit of D-fructose\text{D-fructose}.

Step 2: Stereochemical Configuration — Specifically, the linkage connects the α\alpha-anomer of D-glucopyranose\text{D-glucopyranose} to the β\beta-anomer of D-fructofuranose\text{D-fructofuranose}.

Step 3: Conclusion — Hydrolysis yields α-D-(+)-Glucose\alpha\text{-D-(+)-Glucose} and β-D-(-)-Fructose\beta\text{-D-(-)-Fructose}. This identifies the correct products and their optical rotations.

Remember: The dextrorotation of glucose (+52.5+52.5^\circ) combined with the stronger levorotation of fructose (92-92^\circ) makes the mixture levorotatory (invert sugar).

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Hydrolysis of sucrose gives: (JEE Main 2021) | Canvas Classes