p-nitro-N, N-dimethylaniline cannot be repres | vedclass

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(D) In structures $III$ and $IV$, the nitrogen atom of the nitro group is shown to be bonded to five atoms/groups (pentavalent). Nitrogen belongs to t

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$III$ and $IV$

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(D) In structures $III$ and $IV$, the nitrogen atom of the nitro group is shown to be bonded to five atoms/groups (pentavalent). Nitrogen belongs to the second period and does not have vacant $d-$orbitals in its valence shell, so it cannot expand its covalency beyond $4$. Therefore, structures $III$ and $IV$ are chemically impossible and cannot represent the resonating structures of $p-$nitro$-N, N-$dimethylaniline.

$p-$nitro$-N, N-$dimethylaniline cannot be represented by which of the following resonating structures? (Refer to the provided structures $I, II, III, IV$)

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