Question

Intermolecular hydrogen bonding increases the enthalpy of vapourization of a liquid due to

• A. decrease in the attraction between molecules
• B. increase in the attraction between molecules
• C. decrease in the molar mass of unassociated liquid molecules
• D. increase in the effective molar mass of hydrogen-bonded molecules

Answer 1

Answer: (B), (D)

The correct options are
B

increase in the attraction between molecules

D

increase in the effective molar mass of hydrogen-bonded molecules

H-bonding improves attraction between molecules.

Thus, effective molar mass of the molecule increases.

In effect, boiling point increases.

So, option B and D are correct effects of H-bonding.