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Q 3172091836.     Which of the following structures contributes least towards resonance hybrid?
`overset(-)N = underset(I) overset(+)N = O : N equiv underset(II) overset(+)N - underset(. .) overset(. .)O : text()^(-) : underset(. .)overset(2-)N - underset(III) overset(+)N equiv Otext()^(+) :`
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)