The reaction of glucose with acetic Anhydride, confirms the

Step-by-step solution

Glucose reacts with acetic anhydride to form glucose pentaacetate. The formation of the pentaacetate derivative indicates that there are five hydroxyl ( - OH ) groups present in a molecule of glucose. Since glucose is a stable compound, these five hydroxyl groups must be attached to five different carbon atoms. Answer: presence of five hydroxyl group