According to Huckel's rule, a cyclic, planar, fully conjugated system is strictly classified as anti — GOC and Organic Chemistry Basics Chemistry Question

💡 Solution & Explanation

Anti-aromaticity occurs when a continuous planar conjugated circuit contains $4n \pi$ electrons (e.g., 4, 8, 12). This quantum state is exceptionally unstable. $(4n+2)\pi$ yields aromaticity. An $sp^3$ carbon breaks conjugation entirely, yielding non-aromaticity.