Oxygenase component of a two-component system that degrades 2,4,5-trichlorophenol. Uses FADH(2) supplied by TftC to oxidize 2,4,5-trichlorophenol (2,4,5-TCP) to 2,5-dichloro-p-benzoquinone, which is chemically reduced to 2,5-dichloro-p-hydroquinone (2,5-DiCHQ). Then, TftD oxidizes the latter to 5-chloro-2-hydroxy-p-benzoquinone. kcat is 0.67 sec(-1) with 2,4,5-trichlorophenol as substrate. kcat is 0.41 sec(-1) with 2,4,6-trichlorophenol as substrate. kcat is 0.1 sec(-1) with 2,5-dichloro-p-hydroquinone as substrate. Xenobiotic degradation. Homotetramer. The chlorophenol-4-monooxygenase is composed of an oxygenase component TftD and a reductase component TftC. Belongs to the FADH(2)-utilizing monooxygenase family.