What Bonds Break in Benzoic Acid When It Melts?

[Yngevege]

Basically I want to know which bondings are broken when going from the solid phase to the liquid phase.

I know that benzoic acid makes dimers (though only in gas phase, some say?) and that they have Van der Waals' forces between their rings. I tried to use my knowledge about water: Water have 4 hydrogen bonds in solid phase but less in liquid (avg 3,4?), does the same apply to benzoic acid?

Does anyone have any qualified guesses?:shy:

Basically I want to know which bondings are broken when going from the solid phase to the liquid phase.

 

[chemisttree]

The dimer is through the carboxylic groups. It is seen in the NMR if the right solvent is chosen.