JEE Main · 2019 · Shift-ImediumBIO-060

Which of the following statements is not true about sucrose?

Biomolecules · Class 12 · JEE Main Previous Year Question

Question

Which of the following statements is not true about sucrose?

Options
  1. a

    On hydrolysis, it produces glucose and fructose.

  2. b

    The glycosidic linkage is present between C1\text{C}_1 of α-glucose\alpha\text{-glucose} and C1\text{C}_1 of β-fructose\beta\text{-fructose}.

  3. c

    It is also named as invert sugar.

  4. d

    It is a non-reducing sugar.

Correct Answerb

The glycosidic linkage is present between C1\text{C}_1 of α-glucose\alpha\text{-glucose} and C1\text{C}_1 of β-fructose\beta\text{-fructose}.

Detailed Solution

Step 1: Exploring Sucrose Facts — Sucrose is also known as cane sugar or invert sugar. It is a non-reducing sugar because its anomeric carbons are both involved in the glycosidic bond.

Step 2: Verifying the Linkage — The glycosidic bond in sucrose connects C1\text{C1} of an α-D-glucopyranose\alpha\text{-D-glucopyranose} unit to C2\text{C2} of a β-D-fructofuranose\beta\text{-D-fructofuranose} unit.

Step 3: Identifying the False Statement — Statement (b) incorrectly claims the bond is between C1\text{C1} of glucose and C1\text{C1} of fructose. Thus, (b) is the only not-true statement.

Remember: The α1β2\alpha 1 \rightarrow \beta 2 linkage is the reason why sucrose lacks a free anomeric position.

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Which of the following statements is not true about sucrose? (JEE Main 2019) | Canvas Classes