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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.
So, this carbon, is our sp2 hybridized carbon now, and you can see it's planar around that carbon. And, this is a tertiary carbocation. We have a methyl group here, a methyl group here, and then an alkyl group over here. So, a tertiary carbocation is more stable than a secondary. You can also see at this carbon now we have an sp3 hybridized carbon here, so the geometry around that carbon is tetrahedral. It went from being planar to tetrahedral geometry.