Substances X and Y are both nonpolar. If the volatility of X is higher than that of Y, what is the best explanation?

Nonpolar substances do not have permanent dipoles, so their main intermolecular attraction is London dispersion forces. Higher volatility means molecules escape into the gas phase more easily, which happens when attractions are weaker. Therefore, Y must have stronger London dispersion forces than X, as stated in choice D.

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