Out of the two shown structures, the resonance structure that makes a greater contribution to the resonance hybrid is to be determined. Concept introduction: Resonance structures are alternate Lewis structures that can be drawn for a molecule. The structure with the lowest energy contributes the most. A greater number of atoms (other than hydrogen) with an octet of electrons and a greater number of covalent bonds results in a lower energy structure. A lower number of atoms with formal charge also leads to a lower energy structure.

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Chapter 1, Problem 1.18P

Interpretation Introduction

Interpretation:

Out of the two shown structures, the resonance structure that makes a greater contribution to the resonance hybrid is to be determined.

Concept introduction:

Resonance structures are alternate Lewis structures that can be drawn for a molecule. The structure with the lowest energy contributes the most. A greater number of atoms (other than hydrogen) with an octet of electrons and a greater number of covalent bonds results in a lower energy structure. A lower number of atoms with formal charge also leads to a lower energy structure.

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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**