Involved in resorcinol degradation. Catalyzes the NADPH-dependent conversion of resorcinol into hydroxyquinol through hydroxylation. H(+) + NADPH + O2 + resorcinol = benzene-1,2,4-triol + H2O + NADP(+) Aromatic compound metabolism. Mutant loses the ability to grow on resorcinol, but its ability to grow on hydroxyquinol is the same as that of the wild-type strain.