Both `NF_(3)` and `NH_(3)` possess tetrahedral geometries but the dipole moment of `NF_(3)` (`0.23` De bye ) is very low compared with `1.47`D for `NH_(3)`.This is because

Options

A. fluorine is more electronegative than hydrogen
B. fluorine is bigger than hydrogen
C. `N-F`bonds are less polar than`N-H`bonds
D. bond dipoles tend to cancel the electron dipole due to lone pair.

Answer

4

Explanation

The highly electronegative F atoms attrct electrons, and these moments partly cancel the moment form the lone pair and this reduces both the dipole moment and its donor power.