Which substance has the strongest intermolecular forces?

Question

Use the information and data table to answer the following questions.

Substance	Melting Point	Soluble in water
Unknown 1	60 oC	No
Unknown 2	80 oC	No
Unknown 3	110 oC	Yes
Unknown 4	190 oC	Yes

Answer 1

I would say unknown #.4 for the following reasons.

1 The fact that it is soluble in water suggests that the intermolecular force between water and the substance is strong relative to the intramolecular forces within the substance.

2 The higher melting point in comparison to unknown #3 indicates that #4 has stronger intramolecular forces than #3; therefore, the intermolecular forces of #4 vs. #3 should be stronger for #4 to confer water solubility.