In organic layer test `CS_2` or `CCl_4` is added to lassaigne's extract and then`Cl_2` water or `KMnO_4` is added. This test is used to ditinguish between

Options

A. `Br^(-)` and `I^(-)`
B. `Cl^(-)` and `Br^(-)`
C. `Cl^(-)` and `I^(-)`
D. `Cl^(-)`,`Br^(-)`, and `I^(-)`

Explanation

To solve the question regarding the organic layer test involving CS₂ or CCl₄ and the addition of Cl₂ water or KMnO₄, we will follow these steps:

### Step-by-Step Solution:

1. **Understanding the Organic Layer Test**:
The organic layer test is a qualitative analysis method used to identify halide ions (specifically bromide and iodide) in a given sample.

2. **Preparation of the Sample**:
Start with a sample that contains halide ions (bromide or iodide). This sample is treated with dilute sulfuric acid to convert the halide ions into their respective halogen gases.

3. **Addition of Organic Solvent**:
Add an organic solvent such as CS₂ (carbon disulfide) or CCl₄ (carbon tetrachloride) to the sample. This solvent will help in the extraction of the halogen into the organic layer.

4. **Addition of Chlorine Water or KMnO₄**:
After the organic solvent is added, introduce chlorine water (Cl₂ in water) or potassium permanganate (KMnO₄) to the mixture. This step is crucial as it will react with the halogen that has been extracted into the organic layer.

5. **Observation of the Organic Layer**:
- If bromide ions (Br⁻) are present, the reaction will produce an orange-brown color in the organic layer due to the formation of bromine (Br₂).
- If iodide ions (I⁻) are present, the reaction will produce a violet color in the organic layer due to the formation of iodine (I₂).

6. **Conclusion**:
Based on the color observed in the organic layer, you can distinguish between bromide and iodide ions. An orange-brown layer indicates bromide, while a violet layer indicates iodide.

### Final Answer:
The organic layer test is used to distinguish between bromide ions (Br⁻) and iodide ions (I⁻).