Which of the following is phenol ?

Options

A. Cresol
B. Catechol
C. Benzenol
D. All of these

Explanation

To determine which of the given options is phenol, we need to analyze each compound based on the definition of phenolic compounds. Phenolic compounds are characterized by having a hydroxyl (–OH) group directly attached to a benzene ring.

### Step-by-Step Solution:

1. **Identify the Compounds**: The options given are:
- A) Chrysol
- B) Catechol
- C) Benzenol
- D) All of these

2. **Analyze Chrysol**:
- Chrysol, also known as ortho-cresol, has the structure where a hydroxyl group (–OH) is attached to a benzene ring along with a methyl group (–CH3).
- Structure:
```
OH
|
C6H4-CH3
```
- Since it has the –OH group directly attached to the benzene ring, it qualifies as a phenolic compound.

3. **Analyze Catechol**:
- Catechol has two hydroxyl groups attached to a benzene ring.
- Structure:
```
OH
|
C6H4
|
OH
```
- This compound also meets the criteria for phenolic compounds as it has –OH groups directly attached to the benzene ring.

4. **Analyze Benzenol**:
- Benzenol, commonly known as phenol, has a single hydroxyl group attached to the benzene ring.
- Structure:
```
OH
|
C6H5
```
- This compound is the classic example of a phenolic compound.

5. **Conclusion**:
- All three compounds (Chrysol, Catechol, and Benzenol) have hydroxyl groups directly attached to a benzene ring, thus they are all phenolic compounds.
- Therefore, the correct answer is D) All of these.

### Final Answer:
**D) All of these**