Given below are two statements: Statement I: The structure of Maltose is given below: Maltose is a non-reducing sugar. Statement II: The structure of Lactose is given below: Lactose is a reducing sugar. In the light of the above statements, choose the correct answer from the options given below
D. Statement I is false but Statement II is true
Maltose is a disaccharide composed of two -D-glucose units linked by an (1 4) glycosidic bond. The anomeric carbon (C1) of the second glucose unit has a free hemiacetal group, which can open to form an aldehyde. Therefore, maltose can reduce Tollens' and Fehling's reagents, making it a reducing sugar. Statement I claims that maltose is a non-reducing sugar, so it is false. Lactose is a disaccharide composed of -D-galactose and D-glucose linked by a (1 4) glycosidic bond. Similar to maltose, the anomeric carbon (C1) of the glucose unit in lactose has a free hemiacetal group. This allows it to act as a reducing agent. Statement II correctly identifies lactose as a reducing sugar, so it is true. Therefore, Statement I is false but Statement II is true. Answer: Statement I is false but Statement II is true
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