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Question

In which molecule is van der Waals force most likely to be important in determining the melting point and the boiling point?

A
ICl
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B
Br2
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C
H2S
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D
CO
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Solution

The correct option is B Br2
Boiling point and melting point is determined by the strength of van der Waals forces in the case of non-polar molecules which inturn depends on the size of the molecule.

Since Br2 is non-polar, the van der Waals forces will determine its melting and boiling point. Since the other given molecules are polar, dipole-dipole interactions will determine their melting and boiling point.

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