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Which of the following statements about glucose is incorrect?

1. Glucose dissolves in water because it contains an aldehyde functional group
2. Glucose exists as multiple isomeric forms in its aqueous solution
3. Glucose is an aldohexose
4. Glucose is one of the monomer units in sucrose

Correct answer: Glucose dissolves in water because it contains an aldehyde functional group

Solution

Glucose is soluble in water primarily due to its five hydroxyl (-OH) groups that form hydrogen bonds with water, not primarily because of the aldehyde group. The aldehyde group does not significantly drive water solubility. Statements B, C, and D are all correct: glucose shows mutarotation (alpha and beta anomers in solution), is classified as an aldohexose, and is a monomer of sucrose (along with fructose).

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