If benzene is more stable than cyclohexane then why is the heat of hydrogenation of benzene negative, ie heat is released during the formation of cyclohexane from benzene ?

  • $\begingroup$ What do you mean by "benzene is more stable than cyclohexane". Can you provide a source for that statement? $\endgroup$ – Buck Thorn Apr 4 at 7:54
  • $\begingroup$ Related chemistry.stackexchange.com/q/108726/48509 $\endgroup$ – Alchimista Apr 4 at 8:07
  • $\begingroup$ If it is exothermic means cyclohexane must be more stable than benzene right? But it is not so. How is that possible? $\endgroup$ – Anonymous Apr 4 at 13:26
  • $\begingroup$ "But it is not so". By what measure is it not so? What makes you say, "benzene is more stable than cyclohexane". $\endgroup$ – Buck Thorn Apr 4 at 14:22
  • $\begingroup$ Because benzene is aromatic? That's what others told me but I'm not sure. $\endgroup$ – Anonymous Apr 8 at 4:24

All hydrogenation reactions, not just for benzene, are exothermic. You can refer Why are hydrogenation reactions exothermic .


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