Rank the following dienes in order of decreasing heat of hydrogenation (highest to lowest) 13. Thighest to atio sen...

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Question

Rank the following dienes in order of decreasing heat of hydrogenation (highest to lowest)

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Answer 1

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Answer #1

Concept: the higher the heat of hydrogenation, lower the stability.

The most stable diene is III, because it is most conjugated and most substituted diene.

The least stable is IV.

Order of stability is: III > I > II > IV

Hence, order of heat of hydrogenation is:

IV > II > I > III

Compound II is less stable I because, II contains exo double bond.

Answer 2

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