Chapter 13, Problem 13.38QP

(a)

Interpretation Introduction

To determine: If the given molecule is a constitutional isomer of heptane.

Interpretation: The given molecule is to be identified as constitutional isomer of heptane.

Concept introduction: Constitutional isomers are also known as structural isomers. These compounds consist of same chemical formula but the sequence of atoms to each other is different.

Answer to Problem 13.38QP

The given molecule is a constitutional isomer of heptane. The name of the given isomer is $2,3-\text{dimethylpentane}$.

Explanation of Solution

The molecular formula of heptane is ${\text{C}}_7{\text{H}}_{16}$. The number of carbon atoms present in the given structure is seven as shown in Figure 1 and the molecular formula of the structure is ${\text{C}}_7{\text{H}}_{16}$.

Figure 1

Hence, the given molecule is a constitutional isomer of heptane.

The name of the given isomer is $2,3-\text{dimethylpentane}$.

(b)

Interpretation Introduction

To determine: If the given molecule is a constitutional isomer of heptane.

Interpretation: The given molecule is to be identified as constitutional isomers of heptane.

Concept introduction: Constitutional isomers are also known as structural isomers. These compounds consist of same chemical formula but the sequence of atoms to each other is different.

Answer to Problem 13.38QP

The given molecule is not a constitutional isomer of heptane. The name of the given isomer is cycloheptane.

Explanation of Solution

The number of carbon atoms present in the given structure is seven but due to the cyclic structure the number of hydrogen atoms are $14$ as shown in Figure 2 and the molecular formula of the structure is ${\text{C}}_7{\text{H}}_{14}$.

Figure 2

Hence, the given molecule is not a constitutional isomer of heptane.

The name of the given isomer is cycloheptane.

(c)

Interpretation Introduction

To determine: If the given molecule is a constitutional isomer of heptane.

Interpretation: The given molecule is to be identified as constitutional isomer of heptane.

Concept introduction: Constitutional isomers are also known as structural isomers. These compounds consist of same chemical formula but the sequence of atoms to each other is different.

Answer to Problem 13.38QP

The given structure is a constitutional isomer of heptane. The name of the given isomer is heptane.

Explanation of Solution

The number of carbon atoms present in the given structure is seven as shown in Figure 3 and the molecular formula of the structure is ${\text{C}}_7{\text{H}}_{16}$.

Figure 3

Hence, the given molecule is a constitutional isomer of heptane.

The name of the given isomer is heptane.

(d)

Interpretation Introduction

To determine: If the given molecule is a constitutional isomer of heptane.

Interpretation: The given molecule is to be identified as constitutional isomer of heptane.

Concept introduction: Constitutional isomers are also known as structural isomers. These compounds consist of same chemical formula but the sequence of atoms to each other is different.

Answer to Problem 13.38QP

The given molecule is not a constitutional isomer of heptane. The name of the given isomer is $2,3,4-\text{trimethylpentane}$.

Explanation of Solution

The number of carbon atoms present in the given structure is eight as shown in Figure 4 and the molecular formula of the structure is ${\text{C}}_8{\text{H}}_{18}$.

Figure 4

Hence, the given molecule is not a constitutional isomer of heptane.

The name of the given isomer is $2,3,4-\text{trimethylpentane}$.

(e)

Interpretation Introduction

To determine: If the given molecule is a constitutional isomer of heptane.

Interpretation: The given molecule is to be identified as constitutional isomer of heptane.

Concept introduction: Constitutional isomers are also known as structural isomers. These compounds consist of same chemical formula but the sequence of atoms to each other is different.

Answer to Problem 13.38QP

The given structure is a constitutional isomer of octane. The name of the given isomer is $2-\text{methylheptane}$.

Explanation of Solution

The number of carbon atoms present in the given structure is seven as shown in Figure 5 and the molecular formula of the structure is ${\text{C}}_7{\text{H}}_{16}$.

Figure 5

Hence, the given molecule is a constitutional isomer of heptane.

The name of the given isomer is $2-\text{methylheptane}$.

(f)

Interpretation Introduction

To determine: If the given molecule is a constitutional isomer of heptane.

Interpretation: The given molecule is to be identified as constitutional isomer of heptane.

Concept introduction: Constitutional isomers are also known as structural isomers. These compounds consist of same chemical formula but the sequence of atoms to each other is different.

Answer to Problem 13.38QP

The given structure is a constitutional isomer of octane. The name of the given isomer is $2,2-\text{dimethylpentane}$.

Explanation of Solution

The number of carbon atoms present in the given structure is seven as shown in Figure 6 and the molecular formula of the structure is ${\text{C}}_7{\text{H}}_{16}$.

Figure 6

Hence, the given molecule is a constitutional isomer of heptane.

The name of the given isomer is $2,2-\text{dimethylpentane}$.

Conclusion

1. a. The given molecule is a constitutional isomer of heptane. The name of the given isomer is $2,3-\text{dimethylpentane}$.
2. b. The given molecule is not a constitutional isomer of heptane. The name of the given isomer is cycloheptane.
3. c. The given structure is a constitutional isomer of heptane. The name of the given isomer is heptane.
4. d. The given molecule is not a constitutional isomer of heptane. The name of the given isomer is $2,3,4-\text{trimethylpentane}$.
5. e. The given structure is a constitutional isomer of octane. The name of the given isomer is $2-\text{methylheptane}$.
6. f. The given structure is a constitutional isomer of octane. The name of the given isomer is $2,2-\text{dimethylpentane}$.