Question

The electronegativity difference between N and F is greater than that between N and H yet the dipole moment ofNH3 (1.5 D) is larger than that ofNF_3 (0.2 D). This is because:-

Answer 1

Answer:Correct option (c) in NH3 the atomic dipole and bond dipole are in the same direction whereas in NF3 these are in opposite directions Explanation : The dipole moment of NF3 is 0.24 D and of NH3 is 1.48 D. The dillerence is ciue to fact that while the dipole moment due to N-F bonds in NF2 are in opposite direction to the direction of the dipole moment of the lone pair on N atom which partly cancel out, the dipole moment of N-H bonds in NH3 are in the same direction of the dipole moment of the lone pair on N atom which adds up