If the $HCl$ molecule were completely polar,the expected dipole moment would be $6.12 \ D$,but the experimental value of the dipole moment is $1.03 \ D$. What is the percentage of ionic character (in $\%$)?

Which of the following molecules is non-polar?

Which of the following molecules has a zero dipole moment?

Which has a permanent dipole moment?

Each of the following options contains a set of four molecules. Identify the option$(s)$ where all four molecules possess a permanent dipole moment at room temperature.
$(1)$ $BeCl_2, CO_2, BCl_3, CHCl_3$
$(2)$ $SO_2, C_6H_5Cl, H_2Se, BrF_5$
$(3)$ $BF_3, O_3, SF_6, XeF_6$
$(4)$ $NO_2, NH_3, POCl_3, CH_3Cl$

Which of the following compounds exhibits a net dipole moment?