Distinction between pairs of compounds
Phenol and Benzyl alcohol.
1. Litmus Test.
2. Bromine water test.

Explanation

### Step-by-Step Solution

**1. Litmus Test:**
- **Phenol:** When phenol is tested with litmus paper, it turns blue litmus paper red. This indicates that phenol is acidic in nature due to the presence of the hydroxyl (-OH) group, which can donate a proton (H⁺).
- **Benzyl Alcohol:** In contrast, benzyl alcohol does not change the color of litmus paper. It remains blue, indicating that benzyl alcohol is neutral and does not exhibit acidic properties.

**Conclusion for Litmus Test:**
- **Phenol:** Turns blue litmus red (acidic).
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