Given an example of meta-directing group.

Answer

To answer the question "Give an example of a meta-directing group," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Directing Groups**:
- In electrophilic aromatic substitution reactions, substituents on a benzene ring can influence the position where a new substituent will be added. These groups are classified as either ortho/para-directing or meta-directing.

2. **Identify Meta-Directing Groups**:
- Meta-directing groups are typically electron-withdrawing groups. This means they pull electron density away from the aromatic ring, making it less reactive towards electrophiles at the ortho and para positions.

3. **List Common Examples of Meta-Directing Groups**:
- Some common examples of meta-directing groups include:
- Nitro group (-NO2)
- Carbonyl group (C=O, where R can be any alkyl group)
- Cyanide group (-CN)
- Sulfonic acid group (-SO3H)

4. **Select One Example**:
- Among these, the nitro group (-NO2) is a widely recognized example of a meta-directing group.

5. **Conclusion**:
- Therefore, an example of a meta-directing group is the nitro group (-NO2).