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even when there is a possibility of conjugation why aren't bond lengths equal?

  • $\begingroup$ Could you cite where you found that the bond lengths are not equal? $\endgroup$ – A.K. Mar 19 '19 at 13:20
  • $\begingroup$ Heard of anti aromaticity it destabilizes a cyclic compound so to prevent it no conjugation $\endgroup$ – Aditya Garg Mar 19 '19 at 13:20
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    $\begingroup$ Your title does not match your question. All double bonds are equal all right. $\endgroup$ – Ivan Neretin Mar 19 '19 at 14:09
  • $\begingroup$ Possible duplicate of Resonance structure of cyclobutadiene? $\endgroup$ – Mithoron Mar 19 '19 at 16:47

Anti-aromatic compounds have no delocalization of electrons hence no resonance. To check aromatic character we use huckel's rule of (4n+2)π e- present in a conjugated closed loop. An anti aromatic compound would have only 4nπ electrons which is the case with above mentioned compound . Hence the bond lengths are different. enter image description hereenter image description here

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