What is the molecular geometry for C2F4?

The molecular geometry of C₂F₄ is say, planar tetrahedral or square planar.

This is due to the presence of double bonds between carbon atoms and each carbon atom being bonded to two fluorine atoms. Each carbon atom in C₂F₄ has a steric number of 4, meaning there are four regions of electron density around it, which leads to a planar arrangement. The two double bonds between the carbon atoms and the two single bonds with fluorine atoms arrange themselves to minimize repulsion, resulting in a planar structure.

In summary, the molecular geometry of C₂F₄ can be characterized as planar, allowing for the double bonds and single bonds to arrange themselves efficiently with minimal electron repulsion.