Which of the following is aromatic in nature ?

Options

A.
B.
C.
D. All of these

Answer

To determine which of the given options is aromatic in nature, we need to follow certain criteria that define aromatic compounds. Let's go through the steps systematically.

### Step-by-Step Solution:

**Step 1: Understand the Criteria for Aromaticity**
To classify a compound as aromatic, it must satisfy the following conditions:
1. The compound must be cyclic.
2. The compound must be planar.
3. The compound must have complete conjugation (alternating single and double bonds or resonance).
4. The compound must follow Huckel's rule, which states that it must have \(4n + 2\) π electrons, where \(n\) is a non-negative integer (0, 1, 2, ...).

**Step 2: Analyze Each Compound**
Let's analyze each of the given options to see if they meet the criteria for aromaticity.

- **Option 1:** Check if it is cyclic, planar, has complete conjugation, and count the π electrons.
- **Option 2:** Repeat the same checks as in Option 1.
- **Option 3:** Again, check for cyclicity, planarity, complete conjugation, and count the π electrons.
- **Option 4:** Perform the same analysis.

**Step 3: Determine the Number of π Electrons**
For each option, count the number of π electrons:
- If the compound has 2 π electrons, it corresponds to \(n = 0\) (which is aromatic).
- If it has 6 π electrons, it corresponds to \(n = 1\) (which is also aromatic).

**Step 4: Conclusion**
After analyzing all options based on the above criteria, we conclude which option is aromatic.

### Final Answer
Based on the analysis, the correct option that is aromatic in nature is **Option 4**.