(Answered) Two benzoic acid compounds a and b compound a has

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Two Benzoic acid compounds A and B. Compound A has OCH₃ attached on carbon four, Compound B has NO₂attached on carbon four. Compound A has a PKa of 9.4. Compound B PKa of 13.0. Please explain why the difference in PKa and why compound A is more acidic than compound B. Does inductive effect and electronegativity come into play? How about resonance?

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