Which of the following compound is most reactive towards an electrophite `(E^(+))` ?

Options

A.
B.
C.
D.

Answer

To determine which compound is most reactive towards an electrophile (E⁺), we need to analyze the stabilization of the carbocation that forms during the electrophilic addition reaction. The more stable the carbocation, the more reactive the compound will be towards the electrophile.

### Step-by-Step Solution:

1. **Identify the Compounds**:
- Let's say we have four compounds: A, B, C, and D. We need to analyze each one for its reactivity towards an electrophile.

2. **Understand Electrophilic Addition**:
- In electrophilic addition reactions, the pi bond (which is electron-rich) attacks the electrophile (which is electron-deficient). This results in the formation of a carbocation.

3. **Analyze Carbocation Stability**:
- The stability of the carbocation formed after the electrophilic attack is crucial. The more stable the carbocation, the more reactive the compound will be towards the electrophile.

4. **Evaluate Each Compound**:
- **Compound A**: When it reacts, it forms a carbocation that is resonance-stabilized by three pi bonds. This makes it highly stable.
- **Compound B (Benzene)**: This compound forms a carbocation that is resonance-stabilized by two pi bonds. It is stable but less so than Compound A.
- **Compound C**: Similar to Compound B, it forms a carbocation that is resonance-stabilized by two pi bonds, making it comparable to Compound B in terms of stability.
- **Compound D (Cyclohexene)**: When this compound reacts, it forms a carbocation that is not resonance-stabilized. This makes it the least stable and therefore the least reactive towards the electrophile.

5. **Conclusion**:
- Based on the stability of the carbocations formed, Compound A is the most reactive towards the electrophile because it has the most stable carbocation due to resonance stabilization by three pi bonds.

### Final Answer:
**Compound A is the most reactive towards the electrophile (E⁺).**