Formic acid is stronger than benzoic acid because it has a lower pKa value. Formic acid does not have such a group of electron donors and is stronger than acetic acid.
The acidity...
formic acid is strongest due to -I effect of hydrogen while in benzoic acid there is some cross conjugation due to which it is less acidic than formic and acetic acid is the least ...
The acidity is due to the stablity of congugate base. Here, In Formic acid resonance is stabilised via two equivalent resonating structure. On the other hand, in case of Benzoic ac...