Which of the option is correctly given in the decreasing order of acidity of the organic acids ?

2,4,6 – trinitro phenol commonly known as picric acid is stronger than all of the other acids given. This is due to high -I effect of the nitro group. Then comes the ortho substituted carboxylic acids due to $-{\mathrm{NO}}_2$  groups are strong – I groups. o-methoxy is greater than simple benzoic acid due to -I of oxygen or can be explained by ortho effect.

$P^{ka}$  values, 2,4,6 – trinitrophenol  $p^{ka}=0.67$
  o – nitro benzoic acid  $p^{ka}=2.16$
  o – methoxy benzoic acid  $p^{ka}=4.09$
  Benzoic acid   $P^{ka}=4.16$