In an organic compound , the presence of halogen is detected by

Options

A. lodoform test
B. silver nitrate test
C. Beilstein's test
D. Millons' test

Answer

To detect the presence of halogen in an organic compound, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Tests for Halogens**:
- Halogens can be detected using specific chemical tests. The most notable tests include the Iodoform test, Silver Nitrate test, Bayliss-Tein test, and Millon’s test.

2. **Iodoform Test**:
- This test is used primarily to detect the presence of the acetyl group (COCH3) in aldehydes or ketones. When iodine is added in the presence of sodium hydroxide to a compound containing this group, it produces a yellow precipitate of iodoform (CHI3). However, this test is not directly for halogens but for specific functional groups.

3. **Silver Nitrate Test**:
- This test is used to detect halide ions (like Cl⁻, Br⁻, or I⁻). When silver nitrate (AgNO3) is added to a solution containing halide ions, a precipitate of silver halide forms (e.g., AgCl for chloride ions, which is white). This test indicates the presence of halide ions but not halogens in general.

4. **Bayliss-Tein Test**:
- This is a specific test for detecting halogens. In this test, a clean copper wire is heated to form a copper oxide coating. The wire is then dipped into the organic sample and heated again. If halogens are present, a green flame will be observed, indicating the formation of copper halide.

5. **Millon’s Test**:
- This test is not relevant for detecting halogens; it is used to detect soluble proteins.

6. **Conclusion**:
- Among the tests mentioned, the Bayliss-Tein test is specifically used to detect the presence of halogens in an organic compound.

### Final Answer:
The presence of halogen in an organic compound is detected by the **Bayliss-Tein test**.

---