(1) Sucrose →α−D−Glucose and β−D−Fructose
(2) Lactose →β−D−Galactose and β−D−Glucose
(3) Maltose →α−D−Glucose and α−D−Glucose
a→II
b→I
c→III
Sucrose is made up of two monomers α-D-Glucose and β-D-Fructose.
Lactose is made up of two monomers β-D-Galactose and β-D-Glucose.