Which of the following fundamental criteria represent the necessary conditions for a molecule or ion — Hydrocarbons Chemistry Question

💡 Solution & Explanation

For true aromaticity, a compound must be (A) Planar, allowing adjacent $p$ -orbitals to align; (B) Cyclic and fully conjugated, providing a complete circuit for electron delocalization; and (D) Exhibit high resonance energy (abnormal thermodynamic stability). (C) is factually incorrect; the Huckel rule states that an aromatic species must possess exactly $(4n + 2)$ $\pi$ electrons, not $4n$ (which dictates anti-aromaticity).