Here in the compound $$\pi $$ bond of C = O bond will be at resonance with benzene ring with -M effect. But lone pair of N atom is electron donating group which will make the left benzene ring more active by +M effect than right benzene ring and hence electrophilic substitution reaction will be taken place at ortho- or para- position of left benzene ring. As ortho-product formed is sterically hindered and hence para-product will be major product.