Chapter 15, Problem 15.24SP

(a)

Interpretation Introduction

Interpretation: The class of given cycloocta-1,4-diene as isolated, conjugated, cumulated, or a combination is to be stated.

Concept introduction: Conjugated systems have alternate single and double bonds that results in lower the energy and increase the stability of a molecule. Isolated dienes or polyenes are the compounds that comprise double bonds at the large distances separated by more than one single bond, whereas cumulated dienes or polyenes are the compounds that do not possess any single bond in between the two double bonds.

Answer to Problem 15.24SP

The given compound is classified as isolated diene.

Explanation of Solution

The structure of given diene is shown in figure 1.

Figure 1

It is conferred from the above structure of $\text{cycloocta}-1,4-\text{diene}$ that double bonds are present at large distance and it is separated by more than one single bond. Therefore, it is classified as isolated diene.

(b)

Interpretation Introduction

Interpretation: The class of given cycloocta-1,3-diene as isolated, conjugated, cumulated, or a combination is to be stated.

Concept introduction: Conjugated systems have alternate single and double bonds that results in lower the energy and increase the stability of a molecule. Isolated dienes or polyenes are the compounds that comprise double bonds at the large distances separated by more than one single bond, whereas cumulated dienes or polyenes are the compounds that do not possess any single bond in between the two double bonds.

Answer to Problem 15.24SP

The given compound is classified as conjugated diene.

Explanation of Solution

The structure of given diene is shown in figure 2.

Figure 2

It is conferred from the above structure of $\text{cycloocta}-1,3-\text{diene}$ that double bonds are separated by one single bond. Therefore, it is classified as conjugated diene.

(c)

Interpretation Introduction

Interpretation: The class of given cycloocta-1,2-diene as isolated, conjugated, cumulated, or a combination is to be stated.

Concept introduction: Conjugated systems have alternate single and double bonds that results in lower the energy and increase the stability of a molecule. Isolated dienes or polyenes are the compounds that comprise double bonds at the large distances separated by more than one single bond, whereas cumulated dienes or polyenes are the compounds that do not possess any single bond in between the two double bonds.

Answer to Problem 15.24SP

The given compound is classified as cumulated diene.

Explanation of Solution

The structure of given diene is shown in figure 3.

Figure 3

It is conferred from the above structure of $\text{cycloocta}-1,2-\text{diene}$ that there is no distance between two double bonds and single bond is not present in between them. Therefore, it is classify as cumulated diene.

(d)

Interpretation Introduction

Interpretation: The class of given cycloocta-1,2,5,7-tetraene as isolated, conjugated, cumulated, or a combination is to be stated.

Concept introduction: Conjugated systems have alternate single and double bonds that results in lower the energy and increase the stability of a molecule. Isolated dienes or polyenes are the compounds that comprise double bonds at the large distances separated by more than one single bond, whereas cumulated dienes or polyenes are the compounds that do not possess any single bond in between the two double bonds.

Answer to Problem 15.24SP

The given compound is classified as conjugated polyene.

Explanation of Solution

The structure of given polyene is shown in figure 4.

Figure 4

It is conferred from the above structure of $\text{cycloocta}-1,3,5,7-\text{tetraene}$ that double bonds are separated by only one single bond. Therefore, it is classify as conjugated polyene.

(e)

Interpretation Introduction

Interpretation: The class of given cyclohexa-1,3,5-triene as isolated, conjugated, cumulated, or a combination is to be stated.

Concept introduction: Conjugated systems have alternate single and double bonds that results in lower the energy and increase the stability of a molecule. Isolated dienes or polyenes are the compounds that comprise double bonds at the large distances separated by more than one single bond, whereas cumulated dienes or polyenes are the compounds that do not possess any single bond in between the two double bonds.

Answer to Problem 15.24SP

The given compound is classified as conjugated polyene.

Explanation of Solution

The structure of the given polyene is shown in figure 5.

Figure 5

It is conferred from the above structure of $\text{cyclohexa}-1,3,5-\text{triene}$ that double bonds are separated by only one single bond. Therefore, it is classified as conjugated polyene.

(f)

Interpretation Introduction

Interpretation: The class of given penta-1,2-4-triene as isolated, conjugated, cumulated, or a combination is to be stated.

Concept introduction: Conjugated systems have alternate single and double bonds that results in lower the energy and increase the stability of a molecule. Isolated dienes or polyenes are the compounds that comprise double bonds at the large distances separated by more than one single bond, whereas cumulated dienes or polyenes are the compounds that do not possess any single bond in between the two double bonds.

Answer to Problem 15.24SP

The given compound is classified as cumulated and conjugated polyene.

Explanation of Solution

The structure of given polyene is shown in figure 6.

Figure 6

It is conferred from the above structure of $\text{penta}-1,2,4-\text{triene}$ that two double bonds are not separated by any bond and two double bonds are separated by one single bond. Therefore, it is classified as cumulated and conjugated polyene.