Question

Two statements, one Assertion (A) and the other Reason (R) are given. Choose the correct option.
Assertion (A): Maltose, a disaccharide, is a reducing sugar and is obtained by the partial hydrolysis of starch in presence of the enzyme diastase.
Reason (R): Hydrolysis of one mole of Maltose gives one mole each of \( \alpha\text{-D-Glucose} \) and \( \beta\text{-D-Fructose} \).

• A. A is wrong but R is correct
• B. Both A and R are correct but R is not the correct explanation of A
• C. A is correct but R is wrong
• D. Both A and R are correct and R is the correct explanation of A

Hint:

Maltose = Glucose + Glucose. Always remember: sucrose gives glucose + fructose, but maltose gives only glucose.

Answer 1

The Correct Option is C

Step 1: Analyse Assertion (A).
Maltose is a disaccharide composed of two glucose units linked by a glycosidic bond.
It has a free aldehyde group, so it acts as a reducing sugar.
It is formed by partial hydrolysis of starch in presence of enzyme diastase.
Hence, Assertion (A) is correct.

Step 2: Analyse Reason (R).
Hydrolysis of maltose produces:
\[ \text{Maltose} \xrightarrow{\text{Hydrolysis}} 2\ \text{moles of D-Glucose} \]
It does not produce fructose.

Step 3: Identify the error in Reason.
The statement incorrectly mentions formation of \( \beta\text{-D-Fructose} \), which is wrong.
Maltose contains only glucose units.

Step 4: Conclusion about Reason.
Thus, Reason (R) is incorrect.

Step 5: Final relationship.
Assertion is correct, but Reason is wrong.

Step 6: Final Answer.
\[ \boxed{\text{A is correct but R is wrong}} \]