Which allotrope of carbon is structured as a layered planar network of hexagonally arranged carbon atoms where each carbon is bonded to three others, imparting electrical conductivity?

💡 Solution & Explanation

Graphite consists of sp2 hybridized carbon atoms arranged in planar sheets held together by weak van der Waals forces, allowing layers to slide and electrons to move freely. Diamond is sp3 hybridized in a rigid tetrahedral lattice making it an electrical insulator. Fullerenes form discrete spherical cage molecules containing pentagonal and hexagonal rings.