Here's why:
* Colloids are mixtures where one substance is dispersed evenly throughout another. These dispersed particles are larger than individual molecules but smaller than what can be seen with the naked eye. Examples include milk, fog, and paint.
* Glucose is a single molecule, not a mixture of different substances. It dissolves in water to form a solution, where the individual glucose molecules are dispersed throughout the water.
Therefore, glucose (C6H12O6) is not a colloid.