Glucose reacts with acetic anhydride to form

Options

A. 3
B. 5
C. 4
D. 1

Explanation

To solve the question of what glucose reacts with acetic anhydride to form, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure of Glucose**:
- Glucose is a monosaccharide with the molecular formula C6H12O6. It contains five hydroxyl (–OH) groups.

2. **Understand the Reactant**:
- Acetic anhydride (C4H6O3) is a reagent that can acetylate hydroxyl groups. Each hydroxyl group can react with one molecule of acetic anhydride to form an acetate group.

3. **Count the Hydroxyl Groups**:
- In glucose, there are a total of **5 hydroxyl groups** (–OH).

4. **Reaction with Acetic Anhydride**:
- Each of the 5 hydroxyl groups can react with one molecule of acetic anhydride. Therefore, glucose can react with **5 molecules of acetic anhydride**.

5. **Formation of Glucose Pentacetate**:
- The reaction will lead to the formation of **glucose pentacetate**, where each hydroxyl group of glucose is converted into an acetate group (–OCOCH3).

6. **By-products**:
- The reaction will also produce **5 molecules of acetic acid** as a by-product.

### Final Answer:
- Therefore, when glucose reacts with acetic anhydride, it forms **glucose pentacetate** and **5 molecules of acetic acid**.