As per the literature at 760mm of mercury, p-hydroxy benzoic acid has lower boiling point ($\pu{336^\circ C}$ - ChemSpider) than o-hydroxy benzoic acid ($\pu{372^\circ C}$ - ChemSpider). What is the reason behind this although for the former we can see intermolecular H-bonding?

  • $\begingroup$ One consideration: the para compound can have a "bimolecular" hydrogen bond structure like acetic acid. $\endgroup$ – Oscar Lanzi May 15 '18 at 15:02

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