Thank you :)

Write down the characters for the permutation representation for the Catoms (s-orbitals). Combine with the transfomation properties of z and {x,y} given in the character table to find the characters of the 3-dimensional representation pz for the pz-orbitals and the 6 -dimensional representation pxy for the px and py orbitals. Decompose them. Why can you treat pz and {px,py} separately? Note that the highest symmetry operation, defining the difference between A and B representations is S4. The molecule propadiene adopts a staggered D2d structure. H-atoms 1 and 2 are in the xz-plane, H-atoms 3 and 4 in the yz-plane