Which of the following represents the correct decreasing order of dipole moment?

Which of the following molecules has a zero dipole moment?

Which one of the following molecules is polar?

Which of the following has the maximum dipole moment?

The bond length of $HCl$ molecule is $1.275 \ \text{Å}$ and its dipole moment is $1.03 \ \text{D}$. The ionic character of the molecule (in percent) (charge of the electron $= 4.8 \times 10^{-10} \ \text{esu}$) is

If $HCl$ were purely ionic,its expected dipole moment would be $6.12 \, D$. However,the experimental dipole moment is $1.03 \, D$. Calculate the percentage ionic character. (in $\%$)