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Q. The most unlikely representation of resonance structure of p-nitrophenoxide is

AIIMSAIIMS 2009

Solution:

In structure (c), $N$ atom forms five bonds, ie, has $10$ electrons which is not possible due to absence of $d$-orbitals. Moreover, in this, nitrogen carry positive charge, hence because of these two reasons structure (c) is highly unstable or we can say this structure is not possible.