Which rule is being violated?
15
2s
2p
3p

What do you mean by that? like the contents? the thc level?

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf   

Are you going to give an example of the plant or?