Trans-Glyoxal - OHCCHO

Trans-Glyoxal - OHCCHO:

---

This molecule possesses a center of symmetry, i



---

It also has a C₂ axis which must pass through the center of symmetry, and which is perpendicular to the molecular plane.



---

Since the molecular plane is perpendicular to the C₂ axis (the principal axis) it constitutes a s_h (horizontal) plane.



---

Trans-Glyoxal has no improper axes other than the redundant S₁¹ = s and S₂¹ = I.



Trans-Glyoxal's Symmetry Elements are:
One C₂ axis
One s_h plane
One i, center of inversion.