Which of the following best explains the relative boiling points for Cl2 and HCl

Question

Which of the following best explains the relative boiling points for Cl2 and HCl?

-Cl2 has the higher boiling point because liquid

-Cl2 has stronger London-dispersion forces than liquid HCl.

-Cl2 has the higher boiling point because liquid Cl2 has stronger dipole-dipole forces than liquid HCl.

-HCl has the higher boiling point because liquid HCl has hydrogen-bonding interactions while liquid Cl2 has no hydrogen bonding interactions.

-HCl has the higher boiling point because liquid HCl has dipole-dipole forces while liquid Cl2 does not have dipole-dipole forces.

Explanation / Answer

the answer is "HCl has the higher boiling point because liquid HCl has dipole-dipole forces while liquid Cl2 does not have dipole-dipole forces."

This is so because HCl doesn't form hydrogen bonds with itself. Hydrogen bonding forms only in N,O,F atoms. So the another present interaction is dipole-dipole. Cl2 is a non polar molecule.

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