COMEDK Exam 2015 Solved Paper

Acid strength increases as the electronegativity of halogen increases because the anion formed after H+ ion release, is stabilised by −I-effect.
The order of −I-effect is F>Cl>Br>I.
∴ Order of acidic strength is as follows :
FCH2‌COOH>ClCH2‌COOH>BrCH2‌COOH