Thus, hydrolysis of
sucrose brings about a change in the sign of rotation, from dextro
(+) to laevo (–) and the product is named as invert sugar (ii) Maltose: Another disaccharide, maltose is composed of two
a-D-glucose units in which C1 of one glucose (I) is linked to C4
of another glucose unit (II) 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