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(A) The structures represent different resonance contributors of $p$-nitro-$N,N$-dimethylaniline. Structure $(I)$ is the neutral form with a nitro gro

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(A) The structures represent different resonance contributors of $p$-nitro-$N,N$-dimethylaniline. Structure $(I)$ is the neutral form with a nitro group. Structure $(II)$ is another representation. Structures $(III)$ and $(IV)$ involve charge separation resulting from the strong $+M$ effect of the dimethylamino group and the $-M$ effect of the nitro group,leading to a quinonoid structure. These structures illustrate the delocalization of electrons across the benzene ring.

The provided image shows chemical structures related to resonance and electronic effects. Identify the correct relationship or description for these structures.

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