Chlorine Disinfection: Analyzing Assertion and Reason
Assertion (A) Analysis
The assertion states that chlorine, used as a water disinfectant, generates toxic organochlorine compounds. This is factually correct. When chlorine reacts with naturally occurring organic matter present in water, it can form various disinfection byproducts (DBPs), some of which are organochlorines and can be toxic.
Reason (R) Analysis
The reason explains that hypochlorous acid ($HOCl$), the active form of chlorine in water, reacts rapidly with substances like humic acids and hydroxobenzenes. This is also factually correct. Humic acids and hydroxobenzenes (phenols) are common organic precursors found in natural waters, and $HOCl$ readily reacts with them, leading to the formation of DBPs.
Connecting Assertion and Reason
The rapid reactions described in Reason (R) between hypochlorous acid and organic precursors (humic acids, hydroxobenzenes) are the direct chemical mechanism responsible for the generation of the toxic organochlorine compounds mentioned in Assertion (A).
Conclusion
Based on the analysis:
- Assertion (A) is correct.
- Reason (R) is correct.
- Reason (R) correctly explains the mechanism behind Assertion (A).
Therefore, the correct option is that both (A) and (R) are correct, and (R) is the correct explanation of (A).
