The molecule which have zero dipole moment is

Dipole moment of compound having regular geometry and same type of atoms is zero. It is a vector quantity. The zero dipole moment of BF3 is due to its symmetrical (triangular planar) structure. The three F-atoms lie at the corners of an equilateral triangle with B-atom at the centre. Thus, the vectorial addition of the dipole moment of the three bonds gives a net sum of zero because the resultant of any two dipole moment is equal and opposite to the third. The Î¼NH3=1.46D indicating its unsymmetrical structure. The IμCH2Cl2=1.57D. The molecule uses ^qp3 hybridisation but is not symmetrical.