Which of the following is an organic acid?

Options

A. sulphurous acid
B. nitric acid
C. hydrochloric acid
D. formic acid

Answer

To determine which of the following is an organic acid, we need to analyze the options provided. Organic acids are typically characterized by the presence of a carboxyl group (-COOH) and are derived from living organisms.

### Step-by-Step Solution:

1. **Identify the Acids Given**:
- List the acids provided in the options. For example, they might include:
- Sulfuric Acid (H₂SO₄)
- Phosphoric Acid (H₃PO₄)
- Carbonic Acid (H₂CO₃)
- Acetic Acid (CH₃COOH)

2. **Classify Each Acid**:
- **Sulfuric Acid (H₂SO₄)**: This is an inorganic acid, commonly used in various industrial processes.
- **Phosphoric Acid (H₃PO₄)**: This is also an inorganic acid, often used in fertilizers and food flavoring.
- **Carbonic Acid (H₂CO₃)**: This is a weak acid formed when carbon dioxide is dissolved in water, but it is still considered inorganic.
- **Acetic Acid (CH₃COOH)**: This is an organic acid, known for its presence in vinegar.

3. **Determine the Organic Acid**:
- Among the listed acids, **Acetic Acid (CH₃COOH)** is the only organic acid because it contains the carboxyl group (-COOH) and is derived from biological processes.

4. **Conclusion**:
- Therefore, the answer to the question "Which of the following is an organic acid?" is **Acetic Acid (CH₃COOH)**.