Question

$$\begin{array}{cc}\text{List I}& \text{List II}\\ \text{(A) Sucrose}& \left(i\right)\beta -\text{D-glucose}\\ & C_1-C_4\text{glycosidic linkage}\\ \text{(B) Lactose}& \left(ii\right)\alpha -\text{D-glucose},\beta -\text{D-fructose}\\ & C_1-C_2\text{glycosidic linkage}\\ \text{(C) Cellulose}& \left(iii\right)\beta -\text{D-glucose},\beta -\text{D-galactose}\\ & C_1-C_4\text{glycosidic linkage}\end{array}$$
List-I contains saccharides and List-II contains the monosaccharide units as well as glycosidic bonds.
Choose the correct option considering List-I and List-II.

• A. A - (iii), B - (i), (C) - (ii)
• B. A - (ii), B - (iii), (C) - (i)
• C. A - (i), B - (ii), (C) - (iii)
• D. A - (iii), B - (ii), (C) - (i)

Answer 1

The correct option is B A - (ii), B - (iii), (C) - (i)

(A) In sucrose, $\alpha -\text{D-glucose}$ and $\beta -\text{D-fructose}$ are held together by $C1-C2$ glycosidic linkage where C1 is on the glucosyl subunit and C2 is on the fructosyl unit.

(B) In lactose, $\beta -\text{D-galactose}$ and $\beta -\text{D-glucose}$ are held together by $C1-C4$ glycosidic linkage where C1 is on the galactosyl subunit and C4 is on the glucosyl unit.

(C) Cellulose is polysaccharide containing linear chain of several $\beta -\text{D-glucose}$ units through $C1-C4$ glycosidic linkage.