Which one of the following compounds has $$s{p^2}$$  hydridization?

Solution :
TIPS/Formulae: $$H = \frac{1}{2}\left( {V + M - C + A} \right)$$
$$\eqalign{ & \left( {\text{i}} \right)C{O_2};H = \frac{1}{2}\left( {4 + 0 - 0 + 0} \right) = 2 \cr & \therefore \,sp\,\,{\text{hybridisation}}{\text{.}} \cr & \left( {{\text{ii}}} \right)S{O_2};H = \frac{1}{2}\left( {6 + 0 - 0 + 0} \right) = 3 \cr & \therefore s{p^2}\,\,{\text{hybridisation}}{\text{.}} \cr & \left( {{\text{iii}}} \right)CO;H = \frac{1}{2}\left( {4 + 0 - 0 + 0} \right) = 2 \cr & \therefore sp\,\,{\text{hybridisation}}{\text{.}} \cr} $$