The major product of the following reaction is

Step-by-step solution

PhS ⁻ is a strong nucleophile and dimethylformamide (DMF) is a highly polar aprotic solvent. Condition indicates that nucleophilic substitution ( S _ N 2 ) takes place at 2^ benzylic place, stereochemically it involves inversion of configuration. Aryl group can exhibit neighbouring group or can show anchimeric assistance but not possible here due to deactivity imparted by - NO ₂ and - F . It can be if - OCH ₃ would have been instead of - NO ₂ .