Which one of the following statements is not true?
Show Hint
- Lactose contains \(\alpha\)-glycosidic linkage between C1 of galactose and C4 of glucose
- Lactose is a reducing sugar and it gives Fehling's test
- On acid hydrolysis, lactose gives one molecule of D(+)-glucose and one molecule of D(+)-galactose
- Lactose (C11H22O11) is a disaccharide and it contains 8 hydroxyl groups
The Correct Option is A
Solution and Explanation
(1) says \(\alpha\)-linkage: not true.
(2) The glucose unit has a free anomeric OH (hemiacetal), so lactose is a reducing sugar and gives Fehling's test: true.
(3) Acid hydrolysis gives one D(+)-glucose and one D(+)-galactose: true.
(4) Lactose is a disaccharide with 8 hydroxyl groups (true apart from the formula typo, see notes).
The statement intended as not true is (1).
Answer: (1) Lactose contains \(\alpha\)-glycosidic linkage between C1 of galactose and C4 of glucose
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