b
Hybridisation of carbon \(=s p^{3-n u m b e r\;of\; \pi -bonds}\) \(\ln C O_{2}, \begin{array}{l}{\left(O =C=O\right)} \\ { { \quad 1\pi } \;\;\;\;1 \pi }\end{array}\) hybridisation of carbon

\(=s p^{3-2}=s p\)

In ethyne or acetylene, \(C_{2} H_{2},\left(H-C_{2 \pi}^{=} C-H\right)\)

hybridisation of carbon \(=s p^{3-2}=s p\)