Sucrose reacts with acetic anhydride to form

Options

A. Penta-acetate
B. hexa-acetate
C. Tetra-acetate
D. Octa-acetate

Answer

To solve the question of what product is formed when sucrose reacts with acetic anhydride, we can follow these steps:

### Step 1: Understand the Reactants
- **Sucrose** is a disaccharide composed of glucose and fructose. It contains multiple hydroxyl (–OH) groups.
- **Acetic Anhydride** is a reagent that can acetylate hydroxyl groups, replacing the –OH with an acetyl group (–OCOCH3).

**Hint:** Identify the functional groups in the reactants that will participate in the reaction.

### Step 2: Analyze the Structure of Sucrose
- Draw the structure of sucrose to visualize the location of the hydroxyl groups. Sucrose has a total of **8 hydroxyl groups**.

**Hint:** Count the number of hydroxyl groups in sucrose as they will determine the number of acetyl groups formed.

### Step 3: Reaction Mechanism
- When sucrose reacts with acetic anhydride, each hydroxyl group (–OH) will react with acetic anhydride.
- The reaction involves the formation of an acetyl group (–OCOCH3) from each hydroxyl group.

**Hint:** Remember that each hydroxyl group will be replaced by an acetyl group in the reaction.

### Step 4: Determine the Number of Acetyl Groups
- Since sucrose has 8 hydroxyl groups, it will form **8 acetyl groups** when fully reacted with acetic anhydride.

**Hint:** Keep track of the number of hydroxyl groups to determine the total number of acetyl groups.

### Step 5: Identify the Product
- The product formed from the reaction of sucrose with acetic anhydride, which has 8 acetyl groups, is called **octacetate**.

**Hint:** The prefix "octa-" indicates that there are 8 acetyl groups in the product.

### Step 6: Identify By-products
- During the reaction, acetic acid (CH3COOH) is formed as a by-product when the acetic anhydride reacts with the hydroxyl groups.

**Hint:** Consider any additional products that may form during the reaction.

### Final Conclusion
When sucrose reacts with acetic anhydride, it forms **octacetate** as the main product, and acetic acid as a by-product.

**Final Answer:** The product is **octacetate**.

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