Question

In which compound resonance is not possible
1>$NO_{2 } ^{-}$
2>$ClO ^{-} _{3}$
3>$O_{3}$
4>$NH^{2-}$

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Answer 1

4)NH2- don't show resonance because H is electropositive element and if resonance exist -ve charge comes on H by which it becomes unstable and in NH2- there is no pie bonds by which it can't show resonance.