AIIMS 2018 Chemistry Aromaticity MCQ Question

Structure (I) is more stable than structures (II) and (III) due to its aromaticity, which is characterized by a cyclic, planar arrangement of π electrons that follow Hückel's rule (4n + 2 π electrons), leading to enhanced stability. In contrast, structure (II) lacks aromatic character and does not benefit from resonance stabilization, while structure (III) is stabilized by resonance but does not achieve the same level of stability as structure (I) due to the absence of aromaticity. Thus, the presence of aromaticity in structure (I) makes it the most stable among the options presented.