$(2)$ If $AB _{4}$ molecule is a tetrahedral then it has no lone pair and their structure should be and it should be non polar due to perfect symmetry.
$(3)$ If $AB _{4}$, molecule is a square planar then it should be non polar because vector sum of dipole moment is zero.
$(4)$ If $AB _{4}$ molecule is a rectangular planar then it should be non polar because vector sum of dipole moment is zero.