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(C) The starting material is a bicyclic aromatic system containing an amide group $(-NH-CO-)$. The $-NH-$ group is an activating group (ortho/para dir

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(C) The starting material is a bicyclic aromatic system containing an amide group $(-NH-CO-)$. The $-NH-$ group is an activating group (ortho/para directing) due to the lone pair on nitrogen,while the $-CO-$ group is a deactivating group (meta directing). In the given structure,the $-NH-$ group is attached to the ring. The position ortho to the $-NH-$ group is the most activated position for electrophilic aromatic substitution. Therefore,the electrophile $Br^+$ (generated from $Br_2/FeCl_3$) will attack the position ortho to the $-NH-$ group. Comparing the options,the structure in option $C$ shows the bromine atom at the position ortho to the $-NH-$ group.

The main product of the following reaction will be

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