Which of the following is not used for disinfection of drinking water?

Options

A. Chlorine
B. Ozone
C. Chloramine
D. Phenyl

Answer

**Step-by-Step Solution:**

1. **Understanding Disinfection**: Disinfection of drinking water involves using antimicrobial agents to eliminate or reduce harmful pathogens and non-living organisms. This process is crucial for making water safe for consumption.

2. **Identifying Disinfectants**: Common disinfectants used for drinking water include chlorine, ozone, and chloramine. These agents effectively kill or inhibit the growth of pathogens without significantly degrading the quality of water.

3. **Evaluating the Options**:
- **Chlorine**: A widely used disinfectant that effectively kills bacteria and viruses, making water safe to drink.
- **Ozone**: Another effective disinfectant that does not adversely affect water quality and is used in various water treatment processes.
- **Chloramine**: A compound formed from chlorine and ammonia, it is also a good disinfectant and does not degrade water quality.
- **Phenyl**: While it can kill pathogens, phenyl is not suitable for drinking water disinfection because it degrades water quality and is toxic to living organisms.

4. **Conclusion**: Based on the evaluation of the options, phenyl is identified as the substance that is not used for the disinfection of drinking water due to its harmful effects on water quality and its toxicity.

5. **Final Answer**: The correct answer is **Phenyl** (Option D).

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