Rank the following compounds in order of increasing melting point, putting the compound with the least melting point first.

Question

Quizplus · Accepted Answer

Compounds with stronger intermolecular forces tend to have higher melting points. In Compound I and II, the only intermolecular forces present are London dispersion forces. However, in Compound III, there are also hydrogen bonds between the molecules. Hydrogen bonding is a stronger intermolecular force than London dispersion forces, so Compound III will have the highest melting point. Therefore, the compounds can be ranked in order of increasing melting point as I < II < III. The only option that matches this order is choice C.

Rank the Following Compounds in Order of Increasing Melting Point