16.1 Introduction to Conjugated Systems and Heats of Hydrogenation

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Conjugated vs Cumulated vs Isolated

cumulated diene
isolated diene
conjugated diene
alkyne heat of hydrogenation
PREDICTING RELATIVE HEATS OF HYDROGENATION
1. More pi bonds = more heat released
2. 1 triple bond > 2 double bonds
3. Conjugated < Isolated < Cumulated
4. More substituted pi bonds < Less substituted pi bonds
5. Trans < Cis

Select in each pair the compound with the greater heat of hydrogenation.

greater heat of hydrogenation 01
greater heat of hydrogenation 02
greater heat of hydrogenation 03
greater heat of hydrogenation 04
greater heat of hydrogenation 05
greater heat of hydrogenation 06
greater heat of hydrogenation 07
greater heat of hydrogenation 08