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  4. p-nitro - N, N - dimethylaniline cannot be represented by the resonating structures

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Q. $p$-nitro - $N, N$ - dimethylaniline cannot be represented by the resonating structuresChemistry Question Image

WBJEEWBJEE 2021

Solution:

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Both the structures are impossible as $N ^{\star}$ is pentavalent and we known that $N$ can not expand its valency beyond $4$ due to absence of vacant $d$-orbitals in its valence shell.