Which of the following compounds will give negative Lassaigne is test for Nitrogen?

Options

A.
B.
C.
D.

Answer

To determine which of the following compounds will give a negative Lassaigne's test for nitrogen, we need to understand the principles behind the test and the nature of the compounds involved.

### Step-by-Step Solution:

1. **Understanding Lassaigne's Test**:
- Lassaigne's test is used to detect the presence of nitrogen in organic compounds. The test involves fusing the organic compound with sodium metal, which converts the organic nitrogen into sodium cyanide (NaCN) if nitrogen is present.
- The presence of sodium cyanide indicates a positive test for nitrogen, while its absence indicates a negative test.

2. **Analyzing the Compounds**:
- We need to evaluate the given compounds to see if they can yield sodium cyanide upon fusion with sodium.
- Compounds that contain nitrogen in a stable form (like in aromatic rings or as part of functional groups such as nitro or azo) may not yield sodium cyanide when fused with sodium.

3. **Identifying the Azo Compound**:
- Azo compounds (R-N=N-R') typically do not yield sodium cyanide when subjected to Lassaigne's test because the nitrogen is part of a stable azo bond.
- Therefore, if one of the options is an azo compound, it will give a negative Lassaigne's test for nitrogen.

4. **Conclusion**:
- Based on the analysis, the compound that is an azo compound will give a negative Lassaigne's test for nitrogen. Thus, the correct answer is the azo compound.

### Final Answer:
The compound that will give a negative Lassaigne's test for nitrogen is the azo compound (Option 2).