If we take a look at conjugate base of benzoic acid it is as given below:
Now my question is:
Is delocalisation of non bonding electrons(in the carboxylate part) into the benzene ring possible?
Critical Comment:I think that it won't be possible because we would end up having negative charge on both the oxygen which should make it less stable.
Reference supporting my claim:
Although the reason I gave may or may not be the actual,i don't know, but the reference also claims the same thing i.e delocalisation of non bonding electrons doesn't occur.
Link: https://www.asu.edu/courses/chm233/notes/acids/acids2017.html
scroll down and check this: Factors controlling acidity and under that check 'substituent effects for some aromatic carboxylic acids'