Which of the following molecules will have polar bonds but zero dipole moment?

Which of the following compounds has the highest dipole moment?

Consider the following compounds. Which compound possesses the highest dipole moment?

Which of the following possess a net dipole moment?

If $H-X$ bond length is $2 \ \mathring{A}$ and $H-X$ has dipole moment $5.12 \times 10^{-30} \ C \cdot m$,the $\%$ of covalent character of the molecule is ............. $\%$

Carbon tetrachloride has no net dipole moment because of