The position of the substituent is different for both compounds but their chemical nature is same. So we have to consider the steps in which nitro and bromo groups are attached to the benzene ring.

Option (i) when bromine is treated with Br₂ in presence anhydrous FeBr₃ it undergoes electrophilic substitution to give bromobenzene.

This bromobenzene is ortho para directing due positive mesomeric effect (resonance effect) or +R effect caused by Bromine attached to the ring. This activates the ring with negative charge and allows for electrophilic substitution when treated with conc. HNO₃ and conc. H₂SO₄ at temperature of 323 – 333 K.

Here p-nitrobromobenzene is major product as ortho product has more stearic hindrance due to Br and NO₂.

Option (ii) here we need a meta-derivative of benzene, so we first need to deactivate the benzene by introduction of nitro group using conc. HNO₃ and H₂SO₄ as follows:

Due to presence of nitro group the ring is deactivated by –R effect or negative resonance effect, and positive charge is developed at ortho and para position which makes it less active site for electrophilic substitution. So when treated with Br₂ in presence of FeBr₃ we get a Meta derivative of nitrobenzene.