Question

The correct statement about the following disaccharide is

• A. ring (i) is pyranose with $\alpha$-glycosidic link
• B. ring (i) is furanose with $\alpha$-glycosidic link
• C. ring (ii) is pyranose with $\alpha$-glycosidic link
• D. ring (ii) is pyranose with $\beta$-glycosidic link.

Answer 1

Answer: (A)

The disaccharide is sucrose, with ring (i) having $6$-members and hence is a pyranose and ring (ii) has $5$-members and hence is a furanose. $C-1$ of ring (i) and $C-2$ of ring (ii) has an $\alpha$-glycosidic linkage.