Question

Sucrose is a disaccharide of which of the following?

• A. I, III
• B. I, II
• C. II, III
• D. II, IV

Hint:

Remember the monosaccharide components of common disaccharides like sucrose, lactose, and maltose.

Answer 1

The Correct Option is B

1. Identify the monosaccharide components of sucrose:

Sucrose is a disaccharide made up of glucose and fructose.

2. Identify the structures:

Structure I represents \( \alpha \)-D-glucose.
Structure II represents \( \beta \)-D-fructose.
Structure III represents \( \beta \)-D-glucose.
Structure IV represents \( \alpha \)-D-fructose.

3. Determine the linkage:

In sucrose, \( \alpha \)-D-glucose and \( \beta \)-D-fructose are linked through a glycosidic linkage between C1 of glucose and C2 of fructose.

Therefore, sucrose is a disaccharide of \( \alpha \)-D-glucose (I) and \( \beta \)-D-fructose (II).

Final Answer:
I, II.