Q. Which of the following are monosaccharides?
  1. Glucose
  2. Fructose
  3. Sucrose
  4. Lactose
Select the correct option using the codes given below:

Answer: Only 1 and 2
Notes: Glucose and fructose are monosaccharides, each with the formula C₆H₁₂O₆. Sucrose is a disaccharide composed of glucose and fructose, while lactose is a disaccharide made of glucose and galactose. Therefore, only 1 and 2 are monosaccharides.
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