Question

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

• A. $B>D>C>A$
• B. $B>A>D>C$
• C. $A>B>C>D$
• D. $A>C>B>D$

Answer 1

The correct option is B $B>A>D>C$

$F$ is -I group which will withdraw the electron density toward itself.
$Cl$ is less electron withdrawing group compare to $F$.
$C{H}_3$ is electron donating group.



Hence, the correct order is
$\left(B\right)>\left(A\right)>\left(C\right)>\left(D\right)$