Which monosaccharide unit of lactose is responsible for its reducing property?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Glucose
NCERT (2026-27 edition):
10.1.3 Disaccharides – “(iii) Lactose: It is more commonly known as milk sugar since this disaccharide is found in milk. It is composed of β-D-galactose and β-D-glucose. The linkage is between C1 of galactose and C4 of glucose. Free aldehyde group may be produced at C-1 of glucose unit, hence it is also a reducing sugar.”