Strongest acid among the following is

Options

A. acetic acid
B. `FCH_(2)COOH`
C. `F_(2)CHCOOH`
D. `F_(2)"CC"OOH`

Answer

D

Explanation

Fluorine is a highly electronegative element, it withdraws electron from the neighbouring atom. Therefore, more is the number of fluorine atoms attached , greater will be the acidity of the molecules.e.g. `FCH_(2)COOH` is more acidic than `CH_(3)COOH`.
Therefore, correct order of acidicity is :
`CF_(3)COOH gt CF_(2)HCOOH gt FCH_(2)COOH gt CH_(3)COOH`