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 can follow these steps:

### Step 1: Understand the Reactants
- **Glucose** is a six-carbon sugar with multiple hydroxyl (–OH) groups.
- **Acetic anhydride** is a reagent used to introduce acetyl groups (–COCH3) into organic molecules.

### Step 2: Identify the Reaction
- Acetylation involves the reaction of glucose with acetic anhydride. Each hydroxyl group on glucose can react with an acetyl group from acetic anhydride.

### Step 3: Determine the Number of Hydroxyl Groups
- Glucose has five hydroxyl groups (–OH) that can be acetylated. The structure of glucose is:
- C1: Aldehyde group (–CHO)
- C2 to C5: Hydroxyl groups (–OH)
- C6: Methyl group (–CH2OH)

### Step 4: Calculate the Possible Acetylation Products
- Since glucose has five hydroxyl groups, it can theoretically be fully acetylated to form glucose pentaacetate, where all five –OH groups are replaced by –OCOCH3 groups.

### Step 5: Write the Product Structure
- The product of the complete acetylation of glucose would be glucose pentaacetate, which can be represented as:
- C1: Acetyl group (–COCH3)
- C2 to C5: Acetyl groups (–COCH3)
- C6: Acetyl group (–COCH3)

### Step 6: Identify the Correct Answer
- The correct answer to the question is **B. glucose pentaacetate**, as it is the product formed when all five hydroxyl groups of glucose are acetylated.

### Final Answer:
- Acetylation of glucose with acetic anhydride gives **glucose pentaacetate**.

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