Which of the following compounds has zero dipole moment?

Statement-$1$: $CCl_4$ and $H_2O$ are immiscible with each other. Statement-$2$: $CCl_4$ is a polar solvent.

Which of the following is a non-polar solvent?

Which molecule has both non-polar and polar bonds,but the molecule as a whole is polar?

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 substances does not possess a dipole moment?