Question

Choose the incorrect statements among the following about A, B and C.

• A. A, B and C are invert sugar
• B. B on hydrolysis gives $\alpha -D-\text{glucose}$
• C. A, B and C possess glycosidic linkage
• D. B is the disaccharide and most commonly present in milk

Answer 1

Answer: (A), (D)

B is the disaccharide and most commonly present in milk

As per the given structures, A is Lactose, B is Maltose and C is Sucrose.
(a) We know that, only sucrose is an invert sugar among all three given sugars as hydrolysis of sucrose brings about a change in rotation, from dextro to laevo. Hence, statement (a) is incorrect.
(b) B is maltose and maltose on hydrolysis gives two units of $\alpha -D-\text{glucose}$. Hence, statement (b) is correct.
(c) As can be seen from the structure, all three disaccharides contain glyocosidic linkage. Hence, statement (c) is correct.
(d) A is lactose and is most commonly present in milk. Hence, statement (d) is incorrect.