The atomic hybrid orbitals which make up the bond between C and O in formaldehyde, [tex]CH_{2} O[/tex] will be one s-orbital and two p orbital make sp2 hybridization.
The 3 new hybrid orbitals can only be created through [tex]sp^{2}[/tex] hybridization, which occurs whenever an atom's two pi orbitals including one s orbital overlap with mix together. Consequently, [tex]CH_{2} O[/tex] (Formaldehyde) has [tex]sp^{2}[/tex]hybridization.
It is found that when atoms share one electron then it will form sigma bond whereas when atoms share more than one electrons then it will form pi bond.
Therefore, the hybridization of [tex]CH_{2} O[/tex] will be [tex]sp^{2}[/tex] hybridization.
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