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The following molecules are isomers of each other and have the same number of double bonds....

The following molecules are isomers of each other and have the same number of double bonds. Which would have the more exothermic heat of hydrogenation? Explain.

The following molecules are isomers of each other
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Answer #1

Compound A would have the higher heat of hydrogenation. The more stable a compound is higher is its heat of hydrogenation. In A we have more six membered ring which makes the moelcule more stable as compared to B with a seven membered ring. Compound A also has more resonance structures as compared to B which again increases its stability and thus a higher heat of hydrogenation for it.   

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