In the following reaction the structure of the major product ‘X’ is

Step-by-step solution

As due to presence of lone pair of electrons on nitrogen atom, it will activate the ring and it will stabilize intermediate cation at o- and p- positions so here electrophile NO 2 + attack para position which is better than ortho due to less steric hindrance. As C O group is ring deactivating so ortho ,para with respect to it are ignored.