What are the functional groups present in the structure of maltose?
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- One acetal and one ketal
- One ketal and one hemiketal
- Two acetals
- One acetal and one hemiacetal
The Correct Option is D
Solution and Explanation
The anomeric carbon (C1) of the first glucose carries an -OR group (the glycosidic oxygen) and a ring oxygen: an acetal.
The anomeric carbon (C1') of the second glucose still has a free -OH together with the ring oxygen: a hemiacetal. This is why maltose is a reducing sugar.
Glucose is an aldose, so ketal/hemiketal groups are absent.
Answer: (4) One acetal and one hemiacetal
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