Question

Which of the following is a disaccharide ?

• A. Glucose
• B. Fructose
• C. Sucrose
• D. Starch

Hint:

A disaccharide gives two monosaccharide units on hydrolysis; sucrose gives glucose and fructose.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
A disaccharide yields two monosaccharide units on hydrolysis.

Step 2: Classify the options
Glucose and fructose cannot be hydrolysed further, so they are monosaccharides.
Starch gives many glucose units, so it is a polysaccharide.

Step 3: Sucrose
Sucrose hydrolyses into one glucose and one fructose:
\(\text{C}_{12}\text{H}_{22}\text{O}_{11} + \text{H}_{2}\text{O} \rightarrow \text{C}_{6}\text{H}_{12}\text{O}_{6} + \text{C}_{6}\text{H}_{12}\text{O}_{6}\)

Final Answer:
Sucrose is the disaccharide. \[ \boxed{\text{(C) }\text{Sucrose}} \]