Consider the molecules HCl, HBr, HF, and HI. Which would you expect to have the highest boiling point, and why? (4 points)
HBr, because it has the highest mass and the most electrons.
HCl, because it experiences hydrogen bonding.
HF, because it has the strongest intermolecular force.
HI, because it experiences ion-dipole forces.
Answers
Explanation:
Answer
(a) In HCl,HBr and HI dipole-dipole and London forces are present but in HF besides these, intermolecular hydrogen bonding is also present.
(b) Electronegtativity decreases from Cl to I so, dipole moment decreases from HCl to HI. As the boiling point is increasing from HCl to HI, it means London forces are predominant.
London force is directly proportional to the number of electrons in a molecule.
(c) HF has the highest electronegativity, as a result, has highest dipole moment and also has hydrogen bonding therefore, HF shows the highest boiling point.
Answer: HF, because it has the strongest intermolecular force.
Explanation:
Hydrogen and Fluorine are bonded through hydrogen bonding, which is the strongest intermolecular force.