Resonance Energy

Question

Resonance stabilization is highest in:

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1. **Resonance Stabilization**: The lowering of energy of a molecule due to delocalization of $\pi$ electrons.
2. **Aromaticity**: Molecules that are cyclic, planar, and have $(4n+2)$ $\pi$ electrons (Hückel's Rule) exhibit extraordinary stability.
3. **Comparison**:
   - **Benzene**: Aromatic. All $6$ $\pi$ electrons are perfectly delocalized over the ring. High resonance energy ($\approx 150$ kJ/mol).
   - **Butadiene**: Conjugated, but open-chain. Lower stabilization.
   - **Ethene**: Isolated double bond. Zero resonance stabilization.
   - **Cyclohexane**: Saturated alkane. No $\pi$ system at all.

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Resonance Energy

Select the correct option:

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