Identify the odd species out (which of the species among the following is different from others?)

Options

A.
B.
C.
D.

Answer

To solve the problem of identifying the odd species out among the given compounds, we need to analyze each compound based on the characteristics of aromatic and non-aromatic compounds.

### Step-by-Step Solution:

1. **Understand Aromatic Compounds**:
- Aromatic compounds must be cyclic, have a conjugated pi electron system, follow Huckel's rule (4n + 2 pi electrons), and possess resonance energy.

2. **List the Given Compounds**:
- Assume the compounds are A, B, C, and D. We need to analyze each one.

3. **Analyze Each Compound**:
- **Compound A**: Check if it is cyclic, has conjugated pi electrons, follows Huckel's rule, and has resonance energy.
- **Compound B**: Check the same criteria as above.
- **Compound C**: Check the same criteria as above.
- **Compound D**: Check the same criteria as above.

4. **Identify Aromatic vs Non-Aromatic**:
- After analyzing, determine which compounds are aromatic and which is non-aromatic.
- For example, if Compound B does not meet the criteria for aromaticity, it will be identified as the odd one out.

5. **Conclusion**:
- Based on the analysis, if Compound B is the only one that does not fulfill the aromatic criteria, then it is the odd species out.

### Final Answer:
- The odd species out is **Compound B**, as it is not an aromatic compound.