JEE Main 2026 — Biomolecules Question with Solution
JEE Main 2026 (04 April Shift 1)
Question
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
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
Choose an option
Show full solutionCorrect option: D
Correct answer
DStatement I is false but Statement II is true
Step-by-step explanation
Maltose is a disaccharide composed of two -D-glucose units linked by an 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 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
Lactose is a disaccharide composed of -D-galactose and D-glucose linked by a 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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