How do you find $sp^2$ carbons?

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Answer 1 · 2016-05-13T02:30:56

A carbon having three $sigma$ and one $pi$ bond is $sp^2$ carbon.
While a carbon having 2 $sigma$ and 2 $pi$ is $sp$ carbon.

eg. $O=C=O$ In the molecule of carbon dioxide ( $CO_2$ ) , carbon is having 2 $sigma$ and 2 $pi$ so the carbon is $sp$ hybridised.

eg. in ethene ( $C_2H_4$ ) each carbon is having 3 $sigma$ and one $pi$ , hence $sp^2$ hybridised.

How do you find sp^2sp^2 carbons?