According to difference in their electronegativity, the bond is polar (EN>0.4 are generally consider to be polar, while EN<0.4 bonds are considered to be nonpolar). However, AsCl5 has a trigonal pyramidal structure. It exhibits hybridization and has five equivalent hybrid orbitals directed towards the central of the trigonal pyramid. The<em> five dipoles</em>, which are arranged symmetrically around the central As atom,<em> cancel each other</em> hence resulting in a nonpolar molecule