Which of the following does not give Liebermann's nitroso reaction?

Options

A. a.`PhOH`
B. b.`PhNHCH_(3)`
C. c.`PhN(CH_(3))_(2)`
D. d.`Ph-overset(CH_(3))overset(|)(N)-NO`

Explanation

To determine which of the following compounds does not give Liebermann's nitroso reaction, we need to understand the types of compounds that can participate in this reaction.

### Step-by-Step Solution:

1. **Understand Liebermann's Nitroso Reaction**:
- This reaction is typically observed with phenols, secondary amines, and compounds that contain a nitroso group (-NO).

2. **Identify the Types of Compounds**:
- **Phenols**: These compounds will react positively in the Liebermann's nitroso reaction.
- **Secondary Amines**: These compounds also participate in the reaction.
- **Tertiary Amines**: Tertiary amines do not undergo this reaction because they lack a hydrogen atom on the nitrogen that can be substituted by the nitroso group.

3. **Analyze the Given Options**:
- If we have options that include phenols, secondary amines, and tertiary amines, we can conclude that:
- Phenols and secondary amines will give the Liebermann's nitroso reaction.
- Tertiary amines will not give the reaction.

4. **Conclusion**:
- Therefore, the compound that does not give Liebermann's nitroso reaction is the tertiary amine.

### Final Answer:
The compound that does not give Liebermann's nitroso reaction is **option C** (the tertiary amine).