QUESTION: Which of the following is not an allotrope of carbon?
A Diamond
B Graphite
C Cumene
D Fullerene
ANSWER: Cumene
| Allotropic Form of carbon | Structure | Uses |
| Diamond | Each carbon atom is tetrahedrally bonded to four other carbon atoms. | · Gemstones · Industrial cutting tools · Electronics · Abrasives. |
| Graphite | Layers of hexagonal carbon atoms arranged in a honeycomb lattice. | · Pencils (as graphite) · Lubricants · Batteries · Thermal management materials |
| Fullerene | Molecules of carbon atoms arranged in spherical or cage-like structures. | · Nanotechnology · Drug delivery · Superconductors |
| Graphene | Single layer of hexagonally arranged carbon atoms in a 2D honeycomb lattice. | · Electronics · Nanomaterials · Composites · Sensors |
| Carbon Nanotubes | Rolled-up graphene sheets into cylindrical tubes forming single or multiple walls. | · Nanotechnology · Conductive materials · Structural components |
| Amorphous Carbon | Randomly arranged carbon atoms without a specific repeating pattern. | · Carbon black in tires · Pigments · Adsorbents · Water filtration |