Question

which of the following statements best describes the molecular changes that occur during the reaction shown in figure 1?
a two hydroxyl groups are removed from each glucose molecule, and one water molecule is formed.
b a water molecule is added to the hydroxyl groups to form the covalent bond between the two glucose molecules.
c a hydroxyl group from one glucose molecule and a hydrogen atom from the other glucose molecule are removed, and one water molecule is formed.
d a hydrogen atom in one glucose molecule and a hydroxyl group in the other glucose molecule form a hydrogen bond.

Explanation:

When two glucose molecules undergo a condensation reaction to form a disaccharide, a hydroxyl group (-OH) from one glucose molecule and a hydrogen atom (-H) from the other glucose molecule are removed. These combine to form a water molecule ($H_2O$), and a covalent bond is formed between the two glucose molecules.

Answer:

C. A hydroxyl group from one glucose molecule and a hydrogen atom from the other glucose molecule are removed, and one water molecule is formed