Question

What type of forces are present in HCL AND He?

Answer 1

Hey mate!

HCl is a polar molecule and it has dipole-dipole forces of attraction as well as dispersion or london forces of attraction, but since dispersion force (weak van der Waals force) is much weaker than dipole-dipole force and also as HCl is a polar molecule so dispersion force gets overshadowed by dipole-dipole interaction.

And in He (helium),
Since its an inert gas element of the periodic table doesn't react and form any compound have weak van der Waals force of interaction between the atoms (dispersion force).