- ,Cl - ,CN - etc... Molecules that contain a polar double bond Examples : SO ,CO ,SO etc... Molecules that contain carbon – carbon multiple bond Examples: CH = CH , CH CH ≡ etc... Molecules in which the central atom can expand its octet due to the availability of empty d – orbitals Example: SiF ,SF ,FeCl etc..
All metal oxides CaO,MgO,Na O etc... Carbonium ion CH