Which of these molecules has dispersion forces as its strongest intermolecular force? ${Br}_{2}$ $"Br"_2$ , $H_{2} S$ $"H"_2"S"$ , $HCl$ $"HCl"$ , $CO$ $"CO"$

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Which of these molecules has dispersion forces as its strongest intermolecular force? ${Br}_{2}$ $"Br"_2$ , $H_{2} S$ $"H"_2"S"$ , $HCl$ $"HCl"$ , $CO$ $"CO"$

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Answer 1 · 2017-09-10T04:35:24

Only the molecule with no other intermolecular force would have dispersion forces as its strongest intermolecular force.

By the way, trick question here: which molecule has the highest boiling point?

And since only ${Br}_{2}$ $"Br"_2$ is nonpolar, it is the only one with only dispersion forces.

$H_{2} S$ $"H"_2"S"$ is polar, and has dipole-dipole interactions as its dominant intermolecular force.
$HCl$ $"HCl"$ is polar, and has dipole-dipole interactions as its dominant intermolecular force.
$CO$ $"CO"$ is polar, and has dipole-dipole interactions as its dominant intermolecular force.

As examples, the $C$ $"C"$ end of $CO$ $"CO"$ is partially negative (not $O$ $"O"$ !), and the $Cl$ $"Cl"$ end of $HCl$ $"HCl"$ is partially negative. Which end of $H_{2} S$ $"H"_2"S"$ is partially positive?

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Which of these molecules has dispersion forces as its strongest intermolecular force? ${Br}_{2}$ $"Br"_2$ , $H_{2} S$ $"H"_2"S"$ , $HCl$ $"HCl"$ , $CO$ $"CO"$

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Which of these molecules has dispersion forces as its strongest intermolecular force? Br2"Br"_2, H2S"H"_2"S", HCl"HCl", CO"CO"

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Which of these molecules has dispersion forces as its strongest intermolecular force? ${Br}_{2}$ $"Br"_2$ , $H_{2} S$ $"H"_2"S"$ , $HCl$ $"HCl"$ , $CO$ $"CO"$