The linear shape of CO2 is due to _______.

a.  sp3 hybridisation of carbon

b.  sp hybridisation of carbon

c.  $\mathrm{p\pi }-\mathrm{p\pi }$ bonding between carbon and oxygen

d.  sp2 hybridisation of carbon

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Sigma bond formed by s-s overlap, s-p overlap and p-p overlapping. pi $\left(\mathrm{\pi }\right)$ bond formed p-p overlapping.
The structure of CO2 is
is 2 sigma bonds and 2 pi bonds.
Hybridisation of CO2 is sp and the shape is linear. Due to pi bond, it has $\mathrm{p\pi }-\mathrm{p\pi }$ bonding between carbon and oxygen.