Which of the following give Liebermann nitroso reaction?

Options

A.
B.
C.
D.

Answer

To determine which of the following compounds gives the Liebermann nitroso reaction, we first need to understand what the Liebermann nitroso reaction is and how it works.

### Step-by-Step Solution:

1. **Understanding the Liebermann Nitroso Reaction**:
- The Liebermann nitroso reaction is a chemical test used to identify the presence of phenolic compounds, specifically those containing a phenol group (–OH attached to a benzene ring).
- In this reaction, sodium nitrite (NaNO2) is reacted with hydrochloric acid (HCl) to generate nitrous acid (HNO2), which is the active reagent that reacts with phenolic compounds.

2. **Reaction Mechanism**:
- When phenol is treated with HNO2, it forms a nitroso compound by the electrophilic attack of the nitrous acid on the aromatic ring.
- This leads to the formation of a para-nitroso compound, which can undergo rearrangement to yield a colored product (typically red or blue), indicating the presence of phenol.

3. **Identifying the Compounds**:
- To answer the question, we need to analyze the provided options (not specified here) and identify which of them contains a phenolic structure (a benzene ring with an –OH group).
- Only compounds that have this structure will give a positive Liebermann nitroso reaction.

4. **Conclusion**:
- After analyzing the options, we can conclude that the compound that contains a phenolic group will be the one that gives the Liebermann nitroso reaction.

### Final Answer:
- The correct option is the one that contains a phenolic compound.