The examples of disaccharides are
(A) Sucrose
(B) Maltose
(C) Lactose
(D) Cellulose
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (A), (B) and (C) only
Carbohydrates are classified by the number of monosaccharide units they give on hydrolysis. A disaccharide gives two monosaccharide units (the same or different), joined by a glycosidic linkage. A polysaccharide gives a large number of units.
(A) Sucrose — Correct. Sucrose gives one glucose and one fructose: \( \ce{C12H22O11 + H2O -> C6H12O6}\,(\text{glucose}) + \ce{C6H12O6}\,(\text{fructose}) \).
(B) Maltose — Correct. Maltose is made of two α-D-glucose units joined by a C1–C4 glycosidic linkage.
(C) Lactose — Correct. Lactose, the sugar of milk, is made of one β-D-galactose and one β-D-glucose unit.
(D) Cellulose — Incorrect. Cellulose is a polysaccharide, a long straight chain of thousands of β-D-glucose units; it is the main constituent of plant cell walls.
Shortcut: Cellulose is a polysaccharide, and only Option (1) leaves out (D).
NCERT (2026-27 edition):
Classification of Carbohydrates – “… (ii) Oligosaccharides: Carbohydrates that yield two to ten monosaccharide units, on hydrolysis, are called oligosaccharides. They are further classified as disaccharides, trisaccharides, tetrasaccharides, etc., depending upon the number of monosaccharides, they provide on hydrolysis. Amongst these the most common are disaccharides.
(iii) Polysaccharides: Carbohydrates which yield a large number of monosaccharide units on hydrolysis are called polysaccharides. Some common examples are starch, cellulose, glycogen, gums, etc.”