Chapter 12.2, Problem 16SSC

Interpretation Introduction

Interpretation:

From the given information, molecules that will form hydrogen bonds and molecules in which dispersion force is the only intermolecular force must be explained with reasons.

Concept introduction:

Small electronegative atoms bonded with hydrogen can participate in hydrogen bonding.

Answer to Problem 16SSC

HF can form hydrogen bonds. H₂ will have only dispersion force as the only intermolecular force.

Explanation of Solution

As F is very small and highly electronegative atom it will drag the electron density from H-F bond. Thus a positive pole will be generated on H atom and a negative pole will be generated on F atom which can interact with positive pole of another molecule.

H₂ will be dispersion force which depends on surface area. The electro negativity is not high so H₂S and HCl can’t form hydrogen bonding. These can have dipole-dipole interaction as these are polar molecule unlike H₂.

Conclusion

HF will form hydrogen bonds and H₂ will have dispersion force as the only intermolecular force.