a 4-hydroxy-3-(all-trans-polyprenyl)benzoate + 2 reduced [2Fe-2S]-[ferredoxin] + O2 + 2 H(+) = a 3,4-dihydroxy-5-(all-trans-polyprenyl)benzoate + 2 oxidized [2Fe-2S]-[ferredoxin] + H2O — reaction