The correct order of decreasing acid strength of trichloroacetic acid (A), trifluoroacetic acid
(B) acetic acid
(C) and formic acid
(D) is:

Options

A. `B gt A gt D gt C`
B. `B gt D gt C gt A`
C. `A gt B gt C gt D`
D. `A gt C gt B gt D`

Answer

A

Explanation

`CF_(3)-COOH gt CCl_(3) -COOH gt HCOOH gt CH_(3)COOH` (`K_(a)` order).