Diamond acts as a perfect electrical insulator but exhibits exceptionally high thermal conductivity. — p Block Elements Chemistry Question

💡 Solution & Explanation

In diamond, all carbon atoms are $sp^3$ hybridized, and all four valence electrons are locked in strong localized $\sigma$ bonds. The lack of mobile electrons makes it an electrical insulator, but its highly rigid 3D tetrahedral lattice allows rapid transfer of thermal energy via phonons.