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According to me most stable is Z because it has maximum alpha hydrogen, Between X and Y both have same alpha hydrogen, but X has conjugation. So it is more stable than Y.

So Order is Z>X>Y. Is my explanation correct?

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    $\begingroup$ You are ignoring strain in a cyclobutene ring which has to count for something in stability. $\endgroup$ – matt_black Apr 4 '18 at 10:21
  • $\begingroup$ Yes Sir Your Right, Can Please help me with what other factors I should Look For $\endgroup$ – Chloritone_360 Apr 4 '18 at 10:22
  • $\begingroup$ This is all about ring strain, you do not need to look for ther factors $\endgroup$ – Waylander Apr 4 '18 at 12:23
  • $\begingroup$ ...and the antiaromaticity of cyclobutadiene X. Stereochemistry would help. Y>Z>X $\endgroup$ – user55119 Apr 5 '18 at 18:46

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