Which disaccharide forms a 1,1-glycosidic linkage?

• A. Lactose.
• B. Trehalose.
• C. Maltose.
• D. Sucrose.

Answer: (B)

Verified step by step guidance

1. Understand the concept of glycosidic linkages: Glycosidic linkages are bonds formed between carbohydrate molecules. A 1,1-glycosidic linkage specifically refers to a bond between the anomeric carbon of one sugar and the anomeric carbon of another sugar.
2. Identify the structure of each disaccharide: Analyze the structural formula of each disaccharide option provided (Lactose, Trehalose, Maltose, Sucrose) to determine the type of glycosidic linkage present.
3. Examine Trehalose: Trehalose is known to have a 1,1-glycosidic linkage, where both glucose units are linked through their anomeric carbons.
4. Compare with other disaccharides: Lactose has a 1,4-glycosidic linkage, Maltose has a 1,4-glycosidic linkage, and Sucrose has a 1,2-glycosidic linkage. None of these have a 1,1-glycosidic linkage.
5. Conclude based on structural analysis: Based on the structural analysis, Trehalose is the disaccharide that forms a 1,1-glycosidic linkage.