Correct Answer - B
`.-1` effect exerting (electron withdrawing) ground increase the acidie strenth of an acid by withdrawing elctron density toward itself , they weaken `O-H` bond and thus, the release of `H^(+)` ion by an acid becomes easier.
Wherease `.^(+)1` effect axerting (e releasing) group decreases the acidie strength by donating electron density to O-atom. Further, `-1`effect decrease with distance. Thus, the acidic strength of the given acides would be
strongest acid than other given compound.
