The table below shows some physical properties of halogenated
liquids.
Which of the following statements best explains these data?
(a) The larger the dipole moment, the stronger the intermolecular
forces, and therefore the boiling point is lowest for the
molecule with the largest dipole moment. (b) The dispersion
forces increase from F to Cl to Br; since the boiling point also
increases in this order, the dispersion forces must make a far
greater contribution to intermolecular interactions than
dipole-dipole interactions. (c) The trend in electronegativity
is F > Cl > Br; therefore, the most ionic compound (CH2F2)
has the lowest boiling point, and the most covalent compound
(CH2Br2) has the highest boiling point. (d) Boiling point increases
with molecular weight for these nonpolar compounds.
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