How many moles of acetic anhydride `(Ac_2O)` is required to react completely with 1 mole of sucrose ?

Explanation

To determine how many moles of acetic anhydride (Ac₂O) are required to react completely with 1 mole of sucrose, we can follow these steps:

### Step 1: Understand the Structure of Sucrose
Sucrose is a disaccharide composed of two monosaccharides: glucose and fructose. It has a glycosidic bond between these two sugars. The structure of sucrose contains multiple hydroxyl (–OH) groups.

### Step 2: Count the Hydroxyl Groups
From the structure of sucrose, we can identify that there are a total of 8 hydroxyl (–OH) groups present. Each of these hydroxyl groups can react with acetic anhydride.

### Step 3: Determine the Reaction
When acetic anhydride reacts with a hydroxyl group, it replaces the –OH group with an acetate group (–OAc). Since there are 8 hydroxyl groups in sucrose, each will react with one molecule of acetic anhydride.

### Step 4: Calculate the Moles of Acetic Anhydride Required
Since each of the 8 hydroxyl groups will react with one mole of acetic anhydride, the total amount of acetic anhydride required for complete reaction with 1 mole of sucrose is 8 moles.

### Conclusion
Therefore, **8 moles of acetic anhydride (Ac₂O)** are required to react completely with **1 mole of sucrose**.

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