Acetylation of glucose with acetic anhydride gives

Options

A. Glucose hexaacetate
B. Glucose pentaacetate
C. Glucose butaacetate
D. Glucose diacetate

Answer

To solve the question regarding the acetylation of glucose with acetic anhydride, we will follow these steps:

### Step 1: Understand the Reactants
- **Glucose** is a simple sugar with the formula C6H12O6. It has multiple hydroxyl (–OH) groups that can react with acetic anhydride.
- **Acetic Anhydride** (C4H6O3) is a reagent used for acetylation, which introduces acetyl groups (–COCH3) into organic compounds.

**Hint:** Identify the functional groups present in glucose that can react with acetic anhydride.

### Step 2: Determine the Reaction
- When glucose reacts with acetic anhydride, the hydroxyl groups (-OH) on glucose will react with acetic anhydride to form acetylated derivatives.
- Since glucose has five hydroxyl groups, it can theoretically react with five molecules of acetic anhydride.

**Hint:** Count the number of hydroxyl groups in glucose to determine how many acetic anhydride molecules are needed.

### Step 3: Write the Reaction Equation
- The reaction can be represented as:
\[ \text{Glucose} + 5 \, \text{Acetic Anhydride} \rightarrow \text{Glucose Pentacetate} + 5 \, \text{Acetic Acid} \]

**Hint:** Remember that each hydroxyl group will be replaced by an acetyl group, resulting in the formation of glucose pentacetate.

### Step 4: Identify the Product
- The product of the reaction is **Glucose Pentacetate**. This compound has all five hydroxyl groups of glucose replaced by acetyl groups.

**Hint:** Consider the structure of glucose and visualize how the acetyl groups are attached.

### Step 5: Conclusion
- Therefore, the acetylation of glucose with acetic anhydride yields **Glucose Pentacetate**.

**Final Answer:** Acetylation of glucose with acetic anhydride gives glucose pentacetate.