Which of the following compounds has the least dipole moment?

$A$ diatomic molecule has a dipole moment of $1.2 \, D$. If its bond length is equal to $10^{-10} \, m$,then the fraction of an electronic charge on each atom will be .............. $\%$

Identify the incorrect statement $:-$

Which of the following molecules is non-polar in nature?

Pick out the molecule which has zero dipole moment.

The dipole-dipole interaction energy between polar molecules in the solid state will be proportional to ...... [if $r$ denotes the distance between polar molecules]