To determine the reaction is endothermic or exothermic by using enthaply of formation. Concept introduction: Enthalpy of formation of the reaction can be calculated by following expression, Δ r H ° = ∑ n Δ f H ° ( products ) − ∑ n Δ f H ° ( reactants ) The standard enthalpy of formation is equals to sum of standard enthalpy of formation of products minus sum of standard enthalpy of reactants. If the value of Δ r H ∘ is negative, then the reaction will be exothermic. If the value of Δ r H ∘ is positive, then the reaction will be endothermic.

Question

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** Peak Chemical Shift (d) 5.7 1 Multiplicity multiplate .......... 5.04 double of doublet 2 4.98 double of doublet 3 4.05 doublet of quartet 4 5 LO 3.80 quartet 1.3 doublet 6 Peak Chemical Shift (d) Multiplicity

Answer 1

Question

Chapter 21, Problem 90GQ

Interpretation Introduction

Interpretation:

To determine the reaction is endothermic or exothermic by using enthaply of formation.

Concept introduction:

Enthalpy of formation of the reaction can be calculated by following expression,

ΔrH°=∑nΔfH°(products)−∑nΔfH°(reactants)

The standard enthalpy of formation is equals to sum of standard enthalpy of formation of products minus sum of standard enthalpy of reactants.

If the value of ΔrH∘ is negative, then the reaction will be exothermic.

If the value of ΔrH∘ is positive, then the reaction will be endothermic.

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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** Peak Chemical Shift (d) 5.7 1 Multiplicity multiplate .......... 5.04 double of doublet 2 4.98 double of doublet 3 4.05 doublet of quartet 4 5 LO 3.80 quartet 1.3 doublet 6 Peak Chemical Shift (d) Multiplicity

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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