Heat of hydrogenation depends on the stability and the number if carbons in a mo

Question

Heat of hydrogenation depends on the stability and the number if carbons in a molecule. The higher the number of carbons higher is the heat of hydrogenation and higher the stability of the molecule lower is the heat of hydrogenation. Here we have the molecules in options D and E with conjugation, meaning they have higher stability. Among the two molecules D is a cis isomer while E is a trans isomer. We know that generally trans molecules are more stable than cis isomers. Therefore E has the lowest heat of hydrogenation.

Explanation / Answer

O which has the sma/lest heat hydreganshey - e)

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