The correct option is
D sp hybridisation of
carbon
In
CO2 , C forms
2 sigma bonds and
2 pi bonds with
2 different oxygen atoms.
Hybridisation of C atom due to
2 sigma bonds is sp. There is no lone pair on C atom as it has only
4 valence electrons and all of those are involved in bonding.
Carbon uses one
2s and one
2p electrons to form two sigma bonds with two different O atoms.
Both the O atom have configuration:
Both the O atoms use their one
2p electron to form a sigma bond with the C atom.
When both these O atoms form a second bond with the same C atom, it results in the formation of a pi bond.
These pi bond is formed by
2p electrons of C and
2p electrons of O atom and hence it is called
pπ−pπ bonding.
Due to sp hybridisation and no lone pair on C atom and
pπ−pπ bonding ,
CO2 has a linear shape.