Solution

History about benzene i.e. $$C_6H_6$$- Isolated in 1825 by Michael Faraday who determined $$C:H$$ ratio to be $$1:1$$.
Synthesized in 1834 by Eilhard Mitscherlich who determined molecular formula to be $$C_6H_6$$. He named it benzin later known as benzene.

Orbital structure of benzene
An orbital model for the benzene structure Building the orbital model Benzene is built from hydrogen atoms ($$1s^2$$ ) and carbon atoms ($$1s^2,2s^2,2p_x^1,2py^1$$). Each carbon atom has to join to three other atoms (one hydrogen and two carbons) and doesn't have enough unpaired electrons to form the required number of bonds, so it needs to promote one of the $$2s^2$$ pair into the empty $$2pz$$ orbital.
The new orbitals formed are called $$sp^2$$ hybrids, because they are made by an s orbital and two p orbitals reorganizing themselves.
The three $$sp^2$$ hybrid orbitals arrange themselves as far apart as possible which is at $$120^0$$ to each other in a plane. The remaining p orbital is at right angles to them.
Each carbon atom now looks like the diagram on the right. This is all exactly the same as happens in ethene.
The difference in benzene is that each carbon atom is joined to two other similar carbon atoms instead of just one. Each carbon atom uses the $$sp^2$$hybrids to form sigma bonds with two other carbons and one hydrogen atom.
The Pi Molecular Orbitals of Benzene – Master Organic Chemistry