Question

C. What intermolecular force would be the most significant for the following

molecules? Explain your answer. (6 points)
i. H-F (2 points)
ii. H-Cl (2 points)
iii. H-H (2 points)

Answer 1

In HCl,HH and HI dipole-dipole and London forces are present but in HF besides these, intermolecular hydrogen bonding is also present

Electronegtativity decreases from Cl to H so, dipole moment decreases from HCl to HH. As the boiling point is increasing from HCl to HH, it means London forces are predominant.

London force is directly proportional to the number of electrons in a molecule.

HF has the highest electronegativity, as a result, has highest dipole moment and also has hydrogen bonding therefore, HF shows the highest boiling point.