APFIVE Explaining Melting and Boiling Point Differences
Substance X has a higher melting point than substance Y, but substance Y has a higher boiling point than substance X. Which of the following best accounts for this observation?
A
X has stronger directional forces but Y has greater molar mass
B
X has weaker intermolecular forces than Y
C
Y undergoes hydrogen bonding while X does not
D
X is ionic while Y is covalent
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