The structures for two examples of unsaturated hydrocarbons are to be stated. Structural features that make a hydrocarbon unsaturated are to be stated. Concept introduction: Hydrocarbons are the organic compounds that are composed of carbon and hydrogen. In unsaturated hydrocarbons, at least one double or triple bond is present between the atoms of the compound. To determine: The structures for two examples of unsaturated hydrocarbons and structural features that make a hydrocarbon unsaturated.

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Definition Definition Molecules that have multiple bonds between their carbon atoms. Alkenes are hydrocarbons with a double bond between two adjacent carbon atoms (R 2 C=CR 2 ), whereas alkynes are hydrocarbons with a triple bond between two adjacent carbon atoms R-C=C-R . These two groups are known as unsaturated hydrocarbons. They have fewer hydrogen atoms when compared with alkanes with same number of carbon atoms. The general molecular formula for an unsaturated hydrocarbon can be represented as C n H 2n +2 .

Chapter 21, Problem 24E

Interpretation Introduction

Interpretation: The structures for two examples of unsaturated hydrocarbons are to be stated. Structural features that make a hydrocarbon unsaturated are to be stated.

Concept introduction: Hydrocarbons are the organic compounds that are composed of carbon and hydrogen. In unsaturated hydrocarbons, at least one double or triple bond is present between the atoms of the compound.

To determine: The structures for two examples of unsaturated hydrocarbons and structural features that make a hydrocarbon unsaturated.

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Done 11:14 ⚫ worksheets.beyondlabz.com 5 (a). Using the peak information you listed in the tables for both structures, assign each peak to that portion of the structure that produces the peak in the NMR spectrum. Draw this diagram on your own sheet of paper and attach the sketch of your drawing to this question. Question 6 5 (b). Using the peak information you listed in the tables for both structures, assign each peak to that portion of the structure that produces the peak in the NMR spectrum. Draw this diagram on your own sheet of paper and attach the sketch of your drawing to this question. Question 7 6. Are there any differences between the spectra you obtained in Beyond Labz and the predicted spectra? If so, what were the differences? <

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**

Answer 2

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Definition Definition Molecules that have multiple bonds between their carbon atoms. Alkenes are hydrocarbons with a double bond between two adjacent carbon atoms (R 2 C=CR 2 ), whereas alkynes are hydrocarbons with a triple bond between two adjacent carbon atoms R-C=C-R . These two groups are known as unsaturated hydrocarbons. They have fewer hydrogen atoms when compared with alkanes with same number of carbon atoms. The general molecular formula for an unsaturated hydrocarbon can be represented as C n H 2n +2 .

Chapter 21, Problem 24E

Interpretation Introduction

Interpretation: The structures for two examples of unsaturated hydrocarbons are to be stated. Structural features that make a hydrocarbon unsaturated are to be stated.

Concept introduction: Hydrocarbons are the organic compounds that are composed of carbon and hydrogen. In unsaturated hydrocarbons, at least one double or triple bond is present between the atoms of the compound.

To determine: The structures for two examples of unsaturated hydrocarbons and structural features that make a hydrocarbon unsaturated.

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Answer 3

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Definition Definition Molecules that have multiple bonds between their carbon atoms. Alkenes are hydrocarbons with a double bond between two adjacent carbon atoms (R 2 C=CR 2 ), whereas alkynes are hydrocarbons with a triple bond between two adjacent carbon atoms R-C=C-R . These two groups are known as unsaturated hydrocarbons. They have fewer hydrogen atoms when compared with alkanes with same number of carbon atoms. The general molecular formula for an unsaturated hydrocarbon can be represented as C n H 2n +2 .

Chapter 21, Problem 24E

Interpretation Introduction

Interpretation: The structures for two examples of unsaturated hydrocarbons are to be stated. Structural features that make a hydrocarbon unsaturated are to be stated.

Concept introduction: Hydrocarbons are the organic compounds that are composed of carbon and hydrogen. In unsaturated hydrocarbons, at least one double or triple bond is present between the atoms of the compound.

To determine: The structures for two examples of unsaturated hydrocarbons and structural features that make a hydrocarbon unsaturated.

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Answer 4

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Definition Definition Molecules that have multiple bonds between their carbon atoms. Alkenes are hydrocarbons with a double bond between two adjacent carbon atoms (R 2 C=CR 2 ), whereas alkynes are hydrocarbons with a triple bond between two adjacent carbon atoms R-C=C-R . These two groups are known as unsaturated hydrocarbons. They have fewer hydrogen atoms when compared with alkanes with same number of carbon atoms. The general molecular formula for an unsaturated hydrocarbon can be represented as C n H 2n +2 .

Chapter 21, Problem 24E

Interpretation Introduction