Considering the facts that (i) sucrose forms glycosidic linkage between C1 of glucose and C 2 of fructose, while (ii) lactose forms glycosidic linkage between C1 of galactose and C 4 of glucose Choose the coirect statement.

Question

Considering the facts that (i) sucrose forms glycosidic linkage between C1 of glucose and C 2 of fructose, while (ii) lactose forms glycosidic linkage between C1 of galactose and C 4 of glucose Choose the coirect statement. (A) Both sucrose and lactose are reducing sugars (B) Both sucrose and lactose are non-reducing sugars (C) Sucrose is reducing sugar and lactose is nonreducing sugar (D) Lactose is reducing sugar and sucrose is nonreducing sugar

Tardigrade Admin · Accepted Answer

Sucrose and lactose both are disaccharides.
In sucrose, anomeric-

C_{1}

of

α - D -

glucose and

C_{2}

of

β

-D-fructose are blocked by

1, 2

-glycosidic linkage.
So, it is a non-reducing sugar. In lactose, anomeric

C_{1}

of

β - D

-galactose is blocked by

1, 4

glycosidic linkage but anomeric-

C_{1}

of

β - D

-glucose has free

- O H

group, which shows reducing property.

Q. Considering the facts that (i) sucrose forms glycosidic linkage between C1​ of glucose and C2​ of fructose, while (ii) lactose forms glycosidic linkage between C1​ of galactose and C4​ of glucose Choose the coirect statement.

Both sucrose and lactose are reducing sugars

Both sucrose and lactose are non-reducing sugars

Sucrose is reducing sugar and lactose is nonreducing sugar

Lactose is reducing sugar and sucrose is nonreducing sugar

Q. Considering the facts that
(i) sucrose forms glycosidic linkage between $C_{1}$ of glucose and $C_{2}$ of fructose, while
(ii) lactose forms glycosidic linkage between $C_{1}$ of galactose and $C_{4}$ of glucose
Choose the coirect statement.