Which of the following benzene ring has greater electron density than Toulene

Options

A.
B.
C.
D.

Answer

To determine which benzene ring has greater electron density than toluene, we need to analyze the structure and substituents of the benzene rings in question. Toluene, also known as methylbenzene, has a methyl group (-CH3) attached to the benzene ring.

### Step-by-Step Solution:

1. **Understanding Toluene's Structure**:
- Toluene consists of a benzene ring with a methyl group attached. The methyl group is an electron-donating group due to the +I (inductive) effect, which increases the electron density of the benzene ring slightly.

2. **Identifying Other Benzene Rings**:
- We need to compare the electron density of toluene with other benzene derivatives. The question suggests that we consider aniline (which has an amino group -NH2) as one of the options.

3. **Analyzing Aniline**:
- Aniline has a benzene ring with an amino group (-NH2) attached. The amino group has a lone pair of electrons that can be delocalized into the benzene ring. This delocalization increases the electron density of the ring significantly.

4. **Comparing Electron Density**:
- Since the amino group in aniline can donate electron density through resonance, it increases the overall electron density of the benzene ring more than the methyl group in toluene. Therefore, aniline has greater electron density than toluene.

5. **Conclusion**:
- The benzene ring with greater electron density than toluene is aniline. Thus, the correct option is option three.

### Final Answer:
The benzene ring that has greater electron density than toluene is **aniline** (option three).