Question

Which statement(s) is/are correct about sucrose?

• A. $(C_1-\alpha )\left(OH\right)$ of glucopyranose is linked with $(C_2-\beta )\left(OH\right)$ of fructofuranose
• B. $(C_1-\alpha )\left(OH\right)$ of glucopyranose is linked with $(C_2-\beta )\left(OH\right)$ of fructopyranose
• C. It reduces Fehling's solution
• D. It exhibits mutarotation

Answer 1

The correct option is A $(C_1-\alpha )\left(OH\right)$ of glucopyranose is linked with $(C_2-\beta )\left(OH\right)$ of fructofuranose

Sucrose doesn't reduces Fehling's solution. Sucrose is not a reducing sugar because it does not have an available hydroxyl group The glycosidic bond that forms in sucrose occurs between the anomeric carbons on glucose and fructose which eliminates the availability of the hydroxyl group. The anomeric carbon is the carbon where the ring forms between the hydroxyl carbon and the carbonyl carbon.
Without this hydroxyl group, the ring cannot open and close and therefore not undergo mutarotation. Reducing sugars can undergo mutarotation. Non-reducing sugars cannot undergo mutarotation. Sucrose is not a reducing sugar because it does not have an available hydroxyl group The glycosidic bond that forms in sucrose occurs between the anomeric carbons on glucose and fructose which eliminates the availability of the hydroxyl group. The anomeric carbon is the carbon where the ring forms between the hydroxyl carbon and the carbonyl carbon.

Without this hydroxyl group, the ring cannot open and close and therefore not undergo mutarotation. Reducing sugars can undergo mutarotation. Non-reducing sugars cannot undergo mutarotation.