Which of the following is NOT a disaccharide?

Cellulose

The correct answer is Option (4) → Cellulose

 Disaccharides are formed by condensation of two monosaccharide units. Polysaccharides are long chains of many monosaccharide units.

Explanation of Each Option

Option 1: Sucrose This is incorrect because sucrose is a disaccharide formed from glucose and fructose units joined by a glycosidic bond.

Option 2: Maltose This is incorrect because maltose is also a disaccharide formed from two glucose units linked together.

Option 3: Lactose This is incorrect because lactose is a disaccharide composed of glucose and galactose.

Option 4: Cellulose This is correct because cellulose is a polysaccharide made up of a large number of glucose units linked together. It is not a disaccharide.