Catalyzes the degradation of 2,5-dichloro-2,5-cyclohexadiene-1,4-diol (2,5-DDOL) into 2,5-dichlorohydroquinone (2,5-DCHQ) in vitro. LinX appears not to be involved in gamma-hexachlorocyclohexane (gamma-HCH) degradation pathway, in contrast to LinC which has the same enzymatic activity. 2,5-dichlorocyclohexa-2,5-dien-1,4-diol + NAD(+) = 2,5-dichlorohydroquinone + H(+) + NADH Belongs to the short-chain dehydrogenases/reductases (SDR) family.