Which of the following has zero dipole moment?

Which of the following have zero dipole moment?

Which of the following have zero dipole moment ?

Which one of the following has zero dipole moment?

Which among the following has zero dipole moment BF_(3),mH_(3),H_(2)O ?

The formal charge is the difference between the number of valence electrons in an isolated (i.e. free) atoms and the number of electrons assigned to that atom in a Lewis structure. For a molecule the net dipole moment is the vector addition of bond moment adn lone pair moment. Which of the following has non zero dipole moment and non-planar ?

Each of the following has non zero dipole moment ,except:

Which of the following pairs has zero dipole moment ?

Which of the following has a non zero dipole moment ?