Which of the following molecules does not possess a dipole moment?

Arrange the following compounds in increasing order of their dipole moment :
$HBr$,$H_2S$,$NF_3$ and $CHCl_3$

Arrange the following in order of increasing dipole moment: $H_2O, H_2S, BF_3$.

The standard molar enthalpy of vaporisation $(\Delta_{vap}H^{\circ})$ of $A, B$ and $C$ liquids is $23.3, 41$ and $29 \ kJ \ mol^{-1}$ respectively. The correct order of dipole-dipole attractive forces in these liquids is

Which of the following molecules has the highest dipole moment?

Which compound exhibits the maximum dipole moment among the following?