Assertion (A): Maltose is a reducing sugar.
Reason (R): Maltose is composed of two glucose units in which C-1 of one glucose unit is linked to C-4 of another glucose unit.
Reason (R): Maltose is composed of two glucose units in which C-1 of one glucose unit is linked to C-4 of another glucose unit.
Show Hint
- Both A and R are true and R is the correct explanation of A
- Both A and R are true but R is not the correct explanation of A
- A is true but R is false
- A is false but R is true
The Correct Option is A
Solution and Explanation
Maltose is a disaccharide formed from two \(\alpha\)-D-glucose units. The glycosidic bond is formed between the C-1 of one glucose and C-4 of the other. Importantly: - One of the glucose units retains a free hemiacetal (anomeric) carbon. - This allows maltose to act as a reducing sugar. Thus: - Assertion is correct — maltose is indeed a reducing sugar. - Reason is also correct — the linkage involves C-1 to C-4. - Since the glycosidic linkage does not involve both anomeric carbons (unlike in sucrose), the free anomeric carbon enables reducing behavior. \[ \boxed{\text{Both A and R are true and R is the correct explanation of A.}} \]
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