The correct option is
C ![](https://s3-us-west-2.amazonaws.com/infinitestudent-images/ckeditor_assets/pictures/100004/content_6.png)
Cis isomer of 1,3-dichloropropa-1,2-diene is clearly polar. Its analogue (Z)-1,4-dichlorobuta-1,2,3-triene is also polar!
In allenes, the molecule is planar if the number of consecutive carbons having carbon-carbon double bonds is even.
Contrarily, in perfluoro-1,2-propadiene, there are three (odd number) such carbon atoms.
If we look at the central carbon atom, it is sp hybridized and the sigma bonds are 180° apart.
The central carbon's two pi bonds have to be mutually perpendicular to each other.
This clearly mandates that the terminal FCF planes
also be mutually perpendicular.
![](https://s3-us-west-2.amazonaws.com/infinitestudent-images/ckeditor_assets/pictures/107434/content_perfluoropropadiene.png)
By the extension of the same logic, perfluorobuta-1,2,3-triene is planar!
![](https://s3-us-west-2.amazonaws.com/infinitestudent-images/ckeditor_assets/pictures/107477/content_perfluorobutadiene.png)