Final answer:
The point group for ethylene is D2h. It possesses a mirror plane, perpendicular C2 axes, and reflection planes.
Step-by-step explanation:
The point group for ethylene is D2h.
This means that ethylene possesses a mirror plane (σh) coinciding with the molecular plane and passes through the carbon atoms, two perpendicular C2 axes, and two reflection planes (σv) perpendicular to the molecular plane.
The point group determination was based on the symmetry elements present in the molecule, which include inversion symmetry and mirror planes.