AP EAMCET Engineering 21 Sep 2020 Shift 2 Paper

(c) As −I-effect increases, - COOH group becomes more electron deficient and tendency to loose H+‌+ions increases i.e., acid strength increases.
As +I effect increases. Acid strength decreases.
Thus, correct order of acid strength is : trichloroacetic acid > trifluoroacetic acid > forminc acid > acetic acid.