Which of the following statements `is//are` correct?

Options

A. The common name of benzene-1,2,3-triol is pyrogallol.
B. The common name of benzene-1,2,4-triol is hydroxquinol.
C. The common name of benzene-1,3,5-triol is phoroglucinol.
D. The common name of `(CH_(2) = CH - Ph)` is styrene.

Answer

To determine which of the statements regarding the common names of certain organic compounds are correct, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Identify the first statement**:
- The first statement claims that the common name of benzene-1,2,3-triol is pyrogallol.
- **Structure**: Benzene with three hydroxyl (OH) groups attached to the 1st, 2nd, and 3rd carbon atoms.
- **Common Name**: This is indeed correct; the common name for benzene-1,2,3-triol is pyrogallol.

2. **Identify the second statement**:
- The second statement claims that the common name of benzene-1,2,4-triol is hydroxyquinol.
- **Structure**: Benzene with hydroxyl groups at the 1st, 2nd, and 4th positions.
- **Common Name**: This is also correct; the common name for benzene-1,2,4-triol is hydroxyquinol.

3. **Identify the third statement**:
- The third statement claims that the common name of benzene-1,3,5-triol is phloroglucinol.
- **Structure**: Benzene with hydroxyl groups at the 1st, 3rd, and 5th positions.
- **Common Name**: This is correct; the common name for benzene-1,3,5-triol is phloroglucinol.

4. **Identify the fourth statement**:
- The fourth statement claims that CH2=CH-Ph (styrene) is correct.
- **Structure**: This structure represents styrene, which consists of a vinyl group (CH2=CH) attached to a phenyl group (Ph).
- **Common Name**: This is correct; the common name for this compound is indeed styrene.

### Conclusion:
After analyzing all four statements, we find that:
- **Statement 1**: Correct (pyrogallol)
- **Statement 2**: Correct (hydroxyquinol)
- **Statement 3**: Correct (phloroglucinol)
- **Statement 4**: Correct (styrene)

Thus, **all statements are correct**.

### Final Answer:
All statements are correct.

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