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In this type of bonding the 2s orbital and the three 2p orbitals of the carbon atom are mixed to produce four identical orbitals, a process known as sp3 hybridization. The CS2 molecule is linear and the carbon atom is bonded to each sulphur by a double bond.
The C3 and C4 refer to how these classes of plants assimilate carbon dioxide into their systems. During the first steps in CO2 assimilation, C3 plants form a pair of three carbon-atom molecules.4 plants, on the other hand, initially form four carbon-atom molecules. In C3 plants CO2 enters the leaf through the stomata, which are microscopic pores found on the under-surface of leaves and on stems.