Q. Which of the following are classified as disaccharides?

1. Glucose
2. Fructose
3. Sucrose
4. Lactose

Select the correct option from the codes given below:
Answer: Only 3 & 4
Notes: Sucrose (composed of glucose and fructose) and lactose (composed of glucose and galactose) are disaccharides. Glucose and fructose are monosaccharides. Disaccharides have the general formula C₁₂H₂₂O₁₁. Thus, only sucrose and lactose among the options are disaccharides; glucose and fructose are not.