Answer Posted / m.murali

These two compounds are carboxylic acids.In general the acid strength of carboxylic acids are depends upon stability of
it's carboxylate anion.
In para nitro benzoic acid, nitro group(-I group) is attached
in para position. It with draws electrons from the benzene
ring and stabilized by resonance.
But benzoic acid do not have any substituted group and it's
benzoate anion is less stable than para nitro benzoic acid.
so, para nitro benzoic acid is strong acid than the benzoic
acid.

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