Which of the following disaccharides represents an α(1→4) glycosidic linkage?

• A.
• B.
• C.
• D.

Answer: (C)

Verified step by step guidance

1. Identify the glycosidic linkage in each disaccharide structure. A glycosidic linkage is the bond formed between two monosaccharides.
2. Determine the anomeric carbon in the first monosaccharide. The anomeric carbon is the carbon derived from the carbonyl carbon (C=O) of the open-chain form of the carbohydrate.
3. Check the orientation of the glycosidic bond at the anomeric carbon. An α-glycosidic bond occurs when the hydroxyl group on the anomeric carbon is in the opposite direction (trans) to the CH2OH group.
4. Identify the carbon number in the second monosaccharide where the glycosidic bond is formed. For an α(1→4) linkage, the bond should be between the anomeric carbon (C1) of the first sugar and the fourth carbon (C4) of the second sugar.
5. Analyze each disaccharide structure to see if it matches the criteria for an α(1→4) glycosidic linkage, focusing on the orientation and position of the linkage.