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Use this tag for questions relating to organic molecules and their properties (structure of organic molecules, spectroscopic properties, reaction mechanisms, stereochemistry etc). DO NOT use this tag as the only tag in your question, as this tag by itself cannot appropriately classify your question. Always use this tag in addition to other more specific tags.
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How to explain (non-/anti-) aromaticity in fulvene with the help of resonance structures?
Can someone please explain why the resonance structures of fulvene 1 is non-aromatic and 2 is anti-aromatic?
Why is fulvene non-aromatic, even though it has four $\pi$-electrons and no $\mathrm{sp^3} …