Ortho-dihydroxy benzene is :

Options

A. Carvacrol
B. Resorcinol
C. Catechol
D. Orcinol

Answer

To determine which compound is ortho-dihydroxybenzene, we need to analyze the options provided and identify the correct structure. Let's break down the steps:

### Step-by-Step Solution:

1. **Understanding Ortho-Dihydroxybenzene**:
- Ortho-dihydroxybenzene refers to a benzene ring that has two hydroxyl (–OH) groups attached to adjacent carbon atoms. This means the –OH groups are located at the 1 and 2 positions on the benzene ring.

2. **Analyzing the Options**:
- **Option 1: Carvacrol**:
- Carvacrol has a benzene ring with one hydroxyl group and an isopropyl group. This does not fit the definition of ortho-dihydroxybenzene.
- **Option 2: Resorcinol**:
- Resorcinol has a benzene ring with two hydroxyl groups, but they are in the meta position (1,3-dihydroxybenzene), which does not meet the criteria for ortho-dihydroxybenzene.
- **Option 3: Catechol**:
- Catechol has a benzene ring with two hydroxyl groups at the 1 and 2 positions (ortho position). This fits the definition of ortho-dihydroxybenzene.
- **Option 4: Orsinol**:
- Orsinol has a benzene ring with two hydroxyl groups, but they are not in the ortho position. Therefore, this option is also incorrect.

3. **Conclusion**:
- Based on the analysis, the correct answer is **Catechol**, which is the only compound that qualifies as ortho-dihydroxybenzene.

### Final Answer:
Ortho-dihydroxybenzene is **Catechol**.