Bromine is not recognised by is

Answer

To determine how bromine is not recognized, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Bromine's Recognition**:
- Bromine can be identified through specific reactions and tests. It is important to know these methods to understand what it cannot be recognized by.

2. **Recognizing Bromine**:
- Bromine is known for its ability to turn starch iodide paper blue. This is a common test for halogens.
- Another method is its reaction with ferrous sulfate, which results in a black coloration.

3. **Identifying Non-Recognition Tests**:
- The question specifically asks for tests by which bromine is **not** recognized.
- Bromine does dissolve in carbon disulfide, but this does not serve as a reliable test for its identification.

4. **Color Changes in Organic Solvents**:
- When bromine is dissolved in carbon disulfide, it can produce an orange color in the organic layer. However, this is not a definitive test for bromine.
- Additionally, there is a mention of a violet color that can also appear in certain conditions, but again, this does not serve as a reliable identification method.

5. **Conclusion**:
- Therefore, bromine is not recognized by its ability to dissolve in carbon disulfide to give an orange or violet color to the organic layer.

### Final Answer:
Bromine is not recognized by its ability to dissolve in carbon disulfide to give an orange color or a violet color to the organic layer.

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