Find out anti aromatic compound among the following :

Options

A.
B.
C.
D.

Explanation

To find the anti-aromatic compound among the given options, we need to follow a systematic approach based on the criteria for anti-aromaticity. Here’s a step-by-step solution:

### Step 1: Understand the Criteria for Anti-Aromaticity
1. The compound must be cyclic.
2. It must have a planar structure.
3. It must have 4n π electrons (where n is a non-negative integer).

### Step 2: Analyze Each Option

#### Option A:
- **Structure**: A cyclic compound with 6 π electrons.
- **Analysis**:
- It is cyclic and planar.
- It has 6 π electrons, which fits the formula 4n + 2 (where n = 1).
- Therefore, it is aromatic, not anti-aromatic.

**Conclusion**: Option A is not anti-aromatic.

#### Option B:
- **Structure**: A cyclic compound with 4 π electrons.
- **Analysis**:
- It is cyclic and planar.
- It has 4 π electrons, which fits the formula 4n (where n = 1).
- Thus, it satisfies the criteria for anti-aromaticity.

**Conclusion**: Option B is anti-aromatic.

#### Option C:
- **Structure**: A compound with no cyclic resonance and 6 π electrons.
- **Analysis**:
- It is not cyclic (no cyclic conjugation).
- It has 6 π electrons, fitting the 4n + 2 criterion.

**Conclusion**: Option C is non-aromatic.

#### Option D:
- **Structure**: A cyclic compound with 6 π electrons (due to lone pairs on sulfur).
- **Analysis**:
- It is cyclic and planar.
- It has 6 π electrons, which fits the 4n + 2 criterion.

**Conclusion**: Option D is aromatic, not anti-aromatic.

### Final Conclusion:
The only option that satisfies all the criteria for anti-aromaticity is **Option B**.

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