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