Which of the following allotropes of carbon is a good conductor of electricity due to the presence of free delocalized electrons?

💡 Solution & Explanation

Graphite conducts electricity effectively because each carbon atom forms three covalent bonds using sp2 hybridization, leaving one free delocalized electron per atom to move freely through the layers. Conversely, diamond features sp3 hybridization where all valence electrons are tightly bound, making it an electrical insulator.