In which substance are molecules rigidly arranged? 1) water in a freezer at -2 degrees Celsius
2) water at cup at 22 degrees Celsius
3) water in a pot at 100 degrees Celsius
4) water in a steam engine at 110 degrees Celsius

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   

It is a product