Match List-I with List-II.

List-I	List-II
(a) Sucrose	(i) $$\beta$$-D-Galactose and $$\beta$$-D-Glucose
(b) Lactose	(ii) $$\alpha$$-D-Glucose and $$\beta$$-D-Fructose
(c) Maltose	(iii) $$\alpha$$-D-Glucose and $$\alpha$$-D-Glucose

Choose the correct answer from the options given below:

We need to match each disaccharide with its constituent monosaccharides.

Sucrose is composed of $$\alpha$$-D-Glucose and $$\beta$$-D-Fructose linked by a glycosidic bond between C-1 of glucose and C-2 of fructose. So (a) matches with (ii).

Lactose is composed of $$\beta$$-D-Galactose and $$\beta$$-D-Glucose (though the glucose unit can be in either anomeric form, the galactose unit is in the $$\beta$$ form). These are linked by a $$\beta$$-1,4-glycosidic bond. So (b) matches with (i).

Maltose is composed of two $$\alpha$$-D-Glucose units linked by an $$\alpha$$-1,4-glycosidic bond. So (c) matches with (iii).

Therefore the correct matching is: (a)$$\rightarrow$$(ii), (b)$$\rightarrow$$(i), (c)$$\rightarrow$$(iii).