This post address the acidity of ortho and para hydroxy benzoic acid. However, what effect is there if there are two hydroxy groups ortho to carboxylic group?
I know hydrogen bonding is also at work but won't the two ortho substituents would decrease the acidity by highly destabilising the conjugate base due to steric hindrance and repulsion; as there are three big groups near to each other?
[P.S.:My worksheet claims that ortho di-hydroxy benzoic acid is more acidic(Option-A is correct in below figure). Also, since about the mono-hydroxy substituted benzoic acids are discussed already on the site, so my question is regarding between only di- and mono- hydroxy benzoic acids.)