Whether molecule G or H has more exothermic heat of hydrogenation is to be determined. Concept introduction: The heat of hydrogenation is the amount of energy released when a hydrogen molecule is added to a double or triple bond. It is based on the stability of π systems. The aromatic molecules are more stable compared to nonaromatic compounds. The aromatic molecule has less heat of hydrogenation than the nonaromatic compound having conjugation with the same number of π electrons.

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Chapter 14, Problem 14.44P

Interpretation Introduction

Interpretation:

Whether molecule G or H has more exothermic heat of hydrogenation is to be determined.

Concept introduction:

The heat of hydrogenation is the amount of energy released when a hydrogen molecule is added to a double or triple bond. It is based on the stability of π systems. The aromatic molecules are more stable compared to nonaromatic compounds. The aromatic molecule has less heat of hydrogenation than the nonaromatic compound having conjugation with the same number of π electrons.

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Interpreting NMR spectra is a skill that often requires some amount of practice, which, in turn, necessitates access to a collection of NMR spectra. Beyond Labz Organic Synthesis and Organic Qualitative Analysis have spectral libraries containing over 700 1H NMR spectra. In this assignment, you will take advantage of this by first predicting the NMR spectra for two closely related compounds and then checking your predictions by looking up the actual spectra in the spectra library. After completing this assignment, you may wish to select other compounds for additional practice. 1. Write the IUPAC names for the following two structures: Question 2 Question 3 2. Predict the NMR spectra for each of these two compounds by listing, in the NMR tables below, the chemical shift, the splitting, and the number of hydrogens associated with each predicted peak. Sort the peaks from largest chemical shift to lowest. **Not all slots must be filled**

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