Question

Which of the substances have polar interactions (dipole-dipole forces) between molecules? INF: F2 CIF Cl2

Answer 1

NF₃ and ClF shows polar interaction as they are polar molecules and on the other hand F₂ and Cl₂ are non-polar molecules where dipole moment is zero.

NF3 shows dipole dipole interaction. As F is more electronegative than N so Fluorine atoms attracts the electrons towards itself and the resultant dipole moment becomes opposite to the direction of the lone pair of electrons of N atom.

Dipole moment of NF₃ ( $\mu$ ) = 0.24 D

ClF shows polar interactions as F is more electronegative than Chlorine and $\mu$ is 0.887 D