Question

Which linkage joins the monosaccharide units in sucrose?

• A. \(C_1 - C_4\) glycosidic linkage
• B. \(C_1 - C_2\) glycosidic linkage
• C. \(C_1 - C_6\) glycosidic linkage
• D. \(C_2 - C_4\) glycosidic linkage

Hint:

Remember common carbohydrate linkages:
• Maltose → \(C_1 - C_4\) linkage
• Lactose → \(C_1 - C_4\) linkage
• Sucrose → \(C_1 - C_2\) linkage

Answer 1

The Correct Option is B

Concept: Sucrose is a disaccharide composed of two monosaccharides:
• \(\alpha\)-D-glucose
• \(\beta\)-D-fructose These two units are connected through a glycosidic bond. The bond is formed between specific carbon atoms of the two sugars.

Step 1: Identify the carbon atoms involved in bonding. The glycosidic bond in sucrose is formed between: \[ C_1 \text{ of glucose} \] and \[ C_2 \text{ of fructose} \]

Step 2: Write the linkage type. Thus the linkage is: \[ C_1 - C_2 \] glycosidic linkage.

Step 3: State the final answer. Therefore, sucrose contains a \[ C_1 - C_2 \] glycosidic bond.