Answer: 2) The vapor pressure of liquid A is lower than that of liquid B at room temperature, also lower at 60 C. Which of the following statements concerning about the liquids A and B is always true? A) Both liquids A and B much exhibit hydrogen bonding. B) Both liquids A and B much have ion-induced dipole interactions. C) Both liquids A and B much have ion-dipole forces. D) Both liquids A and B much have London forces. E) Both liquids A and B much have dipole-dipole forces. Answer: ( Solution Option A cannot be true as hydrogen bonding increases boiling point and more is the boiling point less is the vapor pressure.This is also true for option E and D. Dipole-dipole force and London force also affects in the similar manner.Above the boiling point evaporation occurs.To break the intermolecular forces(hydrogen bonding,dipoledipole interaction,London force etc)the molecules must have sufficient energy.Then only evaporation ocurs.Ion-dipole force also works in the sameway.So option C is also incorrect. The right anser is option B.Both liquids A and B must have ion-induced dipole interactions.Because it is weaker than other forces.In the non-polar species the electronic arrangement is disturbed by induction of dipole.Weaker force of attraction,less boiling point higher is the vapor pressure. .