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Question

Which of the following exhibits the weakest inter-molecular forces?
  1. NH3
  2. H2O
  3. HCl
  4. He


Solution

The correct option is D He
H2O and NH3 have hydrogen bonding.
Hydrogen Bonding | Chemistry for Non-MajorsWhy does NH_3 form hydrogen bond but PH_3 does not? As HCl is a polar molecule, so it has dipole-dipole attraction.
He possess weak London dispersion forces.
H-bonding and dipole-dipole attraction are significantly more stronger than london force. Hence, london dispersion forces are the weakest.

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