When salicylic acid is treated with acetic anhydride, we get :

Options

A. aspirin
B. paracetamol
C. salol
D. none of the above

Explanation

To determine the product formed when salicylic acid is treated with acetic anhydride, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactants in this reaction are salicylic acid and acetic anhydride.
- Salicylic acid has the chemical formula C7H6O3, and acetic anhydride has the formula C4H6O3.

2. **Understand the Reaction**:
- When salicylic acid reacts with acetic anhydride, a chemical reaction occurs where the hydroxyl group (-OH) of salicylic acid is acetylated.

3. **Write the Reaction**:
- The reaction can be represented as follows:
\[ \text{Salicylic Acid (C}_7\text{H}_6\text{O}_3\text{)} + \text{Acetic Anhydride (C}_4\text{H}_6\text{O}_3\text{)} \rightarrow \text{Acetylsalicylic Acid (C}_9\text{H}_8\text{O}_4\text{)} + \text{Acetic Acid (C}_2\text{H}_4\text{O}_2\text{)} \]

4. **Identify the Product**:
- The product formed is acetylsalicylic acid, which is commonly known as aspirin.

5. **Conclusion**:
- Therefore, when salicylic acid is treated with acetic anhydride, the product formed is aspirin.

### Final Answer:
- The correct answer is **Option A: Aspirin**.