Organic Chemistry (6th Edition)
Organic Chemistry (6th Edition)
6th Edition
ISBN: 9781260119107
Author: Janice Gorzynski Smith
Publisher: McGraw Hill Education
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Chapter 12, Problem 32P
Interpretation Introduction

Interpretation: The given alkenes are to be matched with their heats of hydrogenation.

Concept introduction: Hydrogenation reaction is exothermic in nature due to the fact that the bonds are stronger in product than in reactant. Heat of hydrogenation can be used as measure for relative stability of alkenes when they are reduced to same alkane. Higher the stability of alkene, lower is the heat of hydrogenation.

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∆H° values obtained for a series of similar reactions are one set of experimental data used to determine the relative stability of alkenes. Explain how the following data suggest that cis-but-2-ene is more stable than but-1-ene (Section 12.3A).
Predict the energy difference between pent-1-ene and cis-pent-2-ene.
4. The enthalpies, AH°, for the hydrogenation of three alkenes are shown below: Alkene A: -50 kcal/mole Alkene B: -60 kcal/mole Alkene C: -70 kcal/mole Which alkene is the least stable and why?

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Organic Chemistry (6th Edition)

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