In how many of the following compound. -OH group directly attached on the benzene ring ?
(1) Glycol , (2)Glycerol , (3)o-cresol , (4)p-cresol , (5)Phenol , (6)aniline , (7) anisol , (8)resorcinol , (9)catehol , (10)Hydroquinone

Answer

To determine how many of the given compounds have an -OH group directly attached to a benzene ring, we will analyze each compound one by one.

### Step-by-Step Solution:

1. **Glycol (Ethylene Glycol)**:
- Structure: HO-CH2-CH2-OH
- Analysis: Glycol does not contain a benzene ring.
- Conclusion: **Not included**.

2. **Glycerol**:
- Structure: HO-CH2-CHOH-CH2-OH
- Analysis: Glycerol also does not contain a benzene ring.
- Conclusion: **Not included**.

3. **o-Cresol**:
- Structure: A benzene ring with -OH group and -CH3 group at the ortho position.
- Analysis: The -OH group is directly attached to the benzene ring.
- Conclusion: **Included**.

4. **p-Cresol**:
- Structure: A benzene ring with -OH group and -CH3 group at the para position.
- Analysis: The -OH group is directly attached to the benzene ring.
- Conclusion: **Included**.

5. **Phenol**:
- Structure: A benzene ring with a single -OH group.
- Analysis: The -OH group is directly attached to the benzene ring.
- Conclusion: **Included**.

6. **Aniline**:
- Structure: A benzene ring with an -NH2 group.
- Analysis: Aniline does not have an -OH group.
- Conclusion: **Not included**.

7. **Anisole**:
- Structure: A benzene ring with an -OCH3 group.
- Analysis: Anisole does not have an -OH group.
- Conclusion: **Not included**.

8. **Resorcinol**:
- Structure: A benzene ring with two -OH groups at the 1,2 positions.
- Analysis: Both -OH groups are directly attached to the benzene ring.
- Conclusion: **Included**.

9. **Catechol**:
- Structure: A benzene ring with two -OH groups at the 1,2 positions.
- Analysis: Both -OH groups are directly attached to the benzene ring.
- Conclusion: **Included**.

10. **Hydroquinone**:
- Structure: A benzene ring with two -OH groups at the 1,4 positions.
- Analysis: Both -OH groups are directly attached to the benzene ring.
- Conclusion: **Included**.

### Summary of Compounds with -OH Groups Directly Attached to Benzene Ring:
- o-Cresol
- p-Cresol
- Phenol
- Resorcinol
- Catechol
- Hydroquinone

### Total Count:
There are **6 compounds** that have an -OH group directly attached to the benzene ring.

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