In the reaction,the major product formed is:

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(D) The reaction involves the electrophilic aromatic substitution of $N$-phenyl-substituted amide (specifically,$N$-phenyl-dihydroisoquinolinone). In

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(D) The reaction involves the electrophilic aromatic substitution of $N$-phenyl-substituted amide (specifically,$N$-phenyl-dihydroisoquinolinone). In the $N$-phenyl group,the nitrogen atom is attached to the phenyl ring. The nitrogen atom has a lone pair,but it is involved in resonance with the adjacent carbonyl group $(C=O)$,which makes the nitrogen atom less electron-donating to the phenyl ring compared to a free amine. However,the nitrogen still acts as an ortho/para-directing group. Due to steric hindrance caused by the bulky dihydroisoquinolinone group attached to the nitrogen,the electrophilic substitution (bromination using $Br_2/Fe$) occurs primarily at the para-position of the $N$-phenyl ring. Therefore,the major product is the para-bromo derivative.

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