Answer :
The hybrid orbitals that make up the pi bond have been [tex]\rm \bold{sp^2}[/tex] orbital. The sigma bonds in C1 have been 3, and pi bonds have been 1.
The tetrafluoroethylene has been consisted of the double bond between the C=C and the single-bonded F atoms.
The pi bond formation in the structure has been mediated by the hybrid orbitals formed by the mixing of the subshells to form the same energy level hybrid for electron sharing.
The pi bond between the Carbon-Carbon has been mediated by the hybrid of 1s and 2p orbital. Thus, the atomic orbital that makes up the pi bond between C1 and C2 has been [tex]\rm \bold{sp^2}[/tex] orbital.
The C1 has been bonded with 2 fluorine and 1 C atom by the sigma bond. Thus the number of sigma bonds on C1 has been 3.
The C1 and C2 have been bonded with the double bond. Thus the C1 has been consisted of 1 pi bond.
For more information about the bonds in the structure, refer to the link:
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