Identify the pair of molecules, both of which have positive values of Dipole moment.

Step-by-step solution

The dipole moment of a molecule depends on its geometry and the polarity of its bonds. A molecule has a non-zero dipole moment if its bond dipoles do not cancel each other out. BF ₃ has a trigonal planar geometry. The three B-F bond dipoles are equal and oriented at 120^ to each other, resulting in a net dipole moment of zero. CCl ₄ has a tetrahedral geometry. The four C-Cl bond dipoles are equal and arranged symmetrically, resulting in a net dipole moment of zero. NF ₃ has a trigonal pyramidal geometry with a lone