Question

Which carbon atom has ring like layer structure?

Answer 1

Benzene has the ring like structure.
It's chemical formula is C6H6

Answer 2

Graphite is composed of layers of carbon atoms that are arranged in 6-membered, hexagonal rings. These rings are attached to one another on their edges. Layers of fused rings can be modeled as an infinite series of fused benzene rings (without the hydrogen atoms). Carbon atoms in these ring arrays are in the sp2-hybridized state. In the sp2 molecular orbital model each carbon atom is attached to three other species, three other carbon atoms in the case of graphite. In this bonding mode the bond angle between adjacent carbon atoms is 120�. These “ring arrays” are arranged in large sheets of carbon atoms, and individual sheets are known as graphene layers. The carbon-carbon bond length in a layer plane is 1.418�. Graphene layers are stacked one on top of another parallel with the “C” crystallographic axis of the hexagonal 4-axis system in which graphite crystallizes.