Why the middle structure is not counted? Why the middle structure is not considered as resonating structure (or is it considered?) No rule is broken here, still I haven't seen the middle structure?

  • $\begingroup$ Can you please explain it more clearly 🙏🙏 $\endgroup$ – Venil Vekariya Apr 5 at 15:32
  • $\begingroup$ Ohh! Got it, Thank you so much brother😊😊 $\endgroup$ – Venil Vekariya Apr 5 at 17:02
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    $\begingroup$ Because it won't enter into the description of the molecule. Or more generally, it could do it marginally / its weight is negligible. The energy of that hypothetical structure is far too high. $\endgroup$ – Alchimista Apr 6 at 8:08
  • $\begingroup$ The earlier comments @NisargBhavsar are incorrect; Alchimista is correct, and it's a shame you have accepted the wrong ones. What you have drawn is a valid resonance structure. And it is quite possible to draw curly arrows that lead to the second structure: just draw a curly arrow from the double bond to what ends up being the negatively charged carbon. Lastly, it's a resonance structure, not resonating. $\endgroup$ – orthocresol Apr 9 at 0:52