The free aldehyde group can be
produced at C1 of second glucose in solution and it shows reducing
properties so it is a reducing sugar Rationalised 2023-24
288
Chemistry
(iii) Lactose: It is more commonly known as milk sugar since this
disaccharide is found in milk It is composed of b-D-galactose and
b-D-glucose The linkage is between C1 of galactose and C4 of
glucose