In the first reaction, the reaction is exothermic. It is because the cylobutene

Question

In the first reaction, the reaction is exothermic. It is because the cylobutene ring is strained and not not as stable as the open butadiene form, tries to achieve its open form butadiene. Hence this reaction is spontaneous and change in enthalpy is negative.

The second reaction is endothermic. This is because, the benzene ring is aromatic and hence much more stable than the form in the product side. Due to this stability factor, this reaction is not spontaneous and change in enthalpy is positive.

Explanation / Answer

Explain why: AH-42kJ/mol BUT AH-42kJ/mol 20 pts

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