3 4 dinitrobenzoic acid benzoic acid which is more acidic
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Nitro group is a deactivation group there fore all three derivatives are definitely more acidic than benzoic acid. O-nitro benzoic acid is most acidic due to ortho effect.
Out of meta and para derivative para is slightly more acidic than meta due to -I as well as -M nature exhibited by nitro group while at para.
Benzoic acid<meta b.a.<para b.a.<ortho b.a.
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