Question:medium

Which linkage joins the monosaccharide units in sucrose?

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Use the fact that sucrose is non-reducing, so both anomeric carbons must be involved. Identify the anomeric carbon number in glucose and in fructose.
Updated On: Aug 14, 2026
  • \(C_1 - C_4\) glycosidic linkage
  • \(C_1 - C_2\) glycosidic linkage
  • \(C_1 - C_6\) glycosidic linkage
  • \(C_2 - C_4\) glycosidic linkage
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The Correct Option is B

Solution and Explanation

Step 1: Understanding the Concept:
Sucrose is a disaccharide formed by the condensation of two monosaccharides: \(\alpha\)-D-glucose and \(\beta\)-D-fructose.
Step 2: Key Formula or Approach:
Glycosidic linkages are formed between the anomeric carbons of the sugars. In sucrose, both anomeric carbons are involved in the bond.
Step 3: Detailed Explanation:
The linkage occurs between the \(C_1\) of the \(\alpha\)-glucose unit and the \(C_2\) of the \(\beta\)-fructose unit. Because both reducing groups (anomeric carbons) are involved in this glycosidic bond, sucrose is a non-reducing sugar.
Step 4: Final Answer:
The linkage is a \(C_1 - C_2\) glycosidic linkage.
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