Question

Consider the following 
Statement-I: Cane sugar is a disaccharide of \(\alpha\)-D-glucose and \(\beta\)-D-fructose
Statement-II: Milk sugar is a disaccharide of \(\alpha\)-D-glucose and \(\beta\)-D-galactose

 

• A. Both statement-I and statement-II are correct
• B. Both statement-I and statement-II are not correct
• C. Statement-I is correct, but statement-II is not correct
• D. Statement-I is not correct, but statement-II is correct

Hint:

Key disaccharides and their monosaccharide components: Sucrose (Cane Sugar):} \(\alpha\)-D-Glucose and \(\beta\)-D-Fructose. Lactose (Milk Sugar):} \(\beta\)-D-Galactose and \(\beta\)-D-Glucose. Maltose:} Two \(\alpha\)-D-Glucose units. Pay attention to the anomeric (\(\alpha\) or \(\beta\)) configuration of the monosaccharide units within the disaccharide structure.

Answer 1

The Correct Option is C

Let's analyze each statement to determine its correctness. |
Statement-I: Cane sugar is a disaccharide of \(\alpha\)-D-glucose and \(\beta\)-D-fructose.
Cane sugar is the common name for sucrose. Sucrose is indeed a disaccharide composed of one unit of \(\alpha\)-D-glucose and one unit of \(\beta\)-D-fructose, linked by an \(\alpha, \beta\)-1,2-glycosidic bond.
Therefore, Statement-I is correct. 
Statement-II: Milk sugar is a disaccharide of \(\alpha\)-D-glucose and \(\beta\)-D-galactose.
Milk sugar is the common name for lactose. Lactose is a disaccharide composed of one unit of \(\beta\)-D-galactose and one unit of \(\beta\)-D-glucose. The linkage is a \(\beta\)-1,4-glycosidic bond between the galactose unit and the glucose unit. The statement incorrectly identifies the glucose unit as \(\alpha\)-D-glucose; in lactose, it is specifically a \(\beta\)-D-glucose unit. 
Therefore, Statement-II is incorrect. Conclusion:
Statement-I is correct.
Statement-II is incorrect.