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Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

Which alkene in each pair has the larger heat of hydrogenation?

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Expert Solution

Step 1

The given pair of alkenes are,

Step 2

The given alkenes have same molecular formula but different position of the double bond. They are both reduced to same alkane on hydrogenation.

Compound I has more substituted double bond with three electron donation groups. In case of compound II, only two electron donating groups are attached to double bonded carbons.

Therefore, compound I is more stable than compound II. Hence, larger heat of hydrogenation is released in case of II.

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