Chapter 12, Problem 12.7E

Interpretation Introduction

(a)

Interpretation:

The structural formula for the given compound is to be drawn.

Concept introduction:

The systematic naming of organic compound is given by IUPAC nomenclature. The naming of organic compound is done such that the structure of organic compound is correctly interpreted from the name.

Rules for writing IUPAC name from structural formula are:

• First identify the longest carbon chain.

• The next step is to identify the groups attached to the longest chain.

• Identify the position, location, and number of the substituents bonded to the carbon chain.

• Use prefix di, tri, tetra if same type of substituents are present.

• Name the substituents in alphabetical order.

Answer to Problem 12.7E

The structural formula for the given compound is shown below.

Explanation of Solution

The given compound is $\text{4-methylcyclohexene}$. The parent chain is cyclohexene, that is, it consists of six carbon atoms in a ring and a double bond between the first and the second carbon atoms. A methyl group is present as a substituent on the fourth carbon atom. Therefore, the structure of $\text{4-methylcyclohexene}$ is given below.

Figure 1

Conclusion

The structural formula of the given compound is shown in figure 1.

Interpretation Introduction

(b)

Interpretation:

The structural formula for the given compound is to be drawn.

Concept introduction:

The systematic naming of organic compound is given by IUPAC nomenclature. The naming of organic compound is done such that the structure of organic compound is correctly interpreted from the name.

Rules for writing IUPAC name from structural formula are:

• First identify the longest carbon chain.

• The next step is to identify the groups attached to the longest chain.

• Identify the position, location, and number of the substituents bonded to the carbon chain.

• Use prefix di, tri, tetra if same type of substituents are present.

• Name the substituents in alphabetical order.

Answer to Problem 12.7E

The structural formula for the given compound is shown below.

Explanation of Solution

The given compound is $\text{2-ethyl-1, 4-pentadiene}$. The parent chain is pentadiene, that is, it consists of five carbon atoms and a double bond between the first, second and the fourth, fifth carbon atoms. An ethyl group is present as a substituent on the second carbon atom. Therefore, the structure of $\text{2-ethyl-1, 4-pentadiene}$ is given below.

Figure 2

Conclusion

The structural formula of the given compound is shown in figure 2.

Interpretation Introduction

(c)

Interpretation:

The structural formula for the given compound is to be drawn.

Concept introduction:

The systematic naming of organic compound is given by IUPAC nomenclature. The naming of organic compound is done such that the structure of organic compound is correctly interpreted from the name.

Rules for writing IUPAC name from structural formula are:

• First identify the longest carbon chain.

• The next step is to identify the groups attached to the longest chain.

• Identify the position, location, and number of the substituents bonded to the carbon chain.

• Use prefix di, tri, tetra if same type of substituents are present.

• Name the substituents in alphabetical order.

Answer to Problem 12.7E

The structural formula for the given compound is shown below.

Explanation of Solution

The given compound is $\text{4, 4, 5-trimethyl-2-heptyne}$. The parent chain is $\text{2-}$ heptyne, that is, it consists of seven carbon atoms and triple bond between the second and the third carbon atoms. Two methyl groups are present as substituents on the fourth carbon atom and one methyl group is present on the fifth carbon atom. Therefore, the structure of $\text{4, 4, 5-trimethyl-2-heptyne}$ is given below.

Figure 3

Conclusion

The structural formula of the given compound is shown in figure 3.

Interpretation Introduction

(d)

Interpretation:

The structural formula for the given compound is to be drawn.

Concept introduction:

The systematic naming of organic compound is given by IUPAC nomenclature. The naming of organic compound is done such that the structure of organic compound is correctly interpreted from the name.

Rules for writing IUPAC name from structural formula are:

• First identify the longest carbon chain.

• The next step is to identify the groups attached to the longest chain.

• Identify the position, location, and number of the substituents bonded to the carbon chain.

• Use prefix di, tri, tetra if same type of substituents are present.

• Name the substituents in alphabetical order.

Answer to Problem 12.7E

The structural formula for the given compound is shown below.

Explanation of Solution

The given compound is $\text{4-isopropyl-3, 3-dimethyl-1, 5-octadiene}$. The parent chain is $\text{1, 5-}$ octadiene, that is, it consists of a carbon chain having eight carbon atoms and a double bond between the first, second and the fifth, sixth carbon atoms. An isopropyl group and two methyl groups are present as substituents on the fourth and third carbon atoms respectively. Therefore, the structure of $\text{4-isopropyl-3, 3-dimethyl-1, 5-octadiene}$ is given below.

Figure 4

Conclusion

The structural formula of the given compound is shown in figure 4.

Interpretation Introduction

(e)

Interpretation:

The structural formula for the given compound is to be drawn.

Concept introduction:

The systematic naming of organic compound is given by IUPAC nomenclature. The naming of organic compound is done such that the structure of organic compound is correctly interpreted from the name.

Rules for writing IUPAC name from structural formula are:

• First identify the longest carbon chain.

• The next step is to identify the groups attached to the longest chain.

• Identify the position, location, and number of the substituents bonded to the carbon chain.

• Use prefix di, tri, tetra if same type of substituents are present.

• Name the substituents in alphabetical order.

Answer to Problem 12.7E

The structural formula for the given compound is shown below.

Explanation of Solution

The given compound is $\text{2-methyl-1, 3-cyclopentadiene}$. The parent chain is $\text{1, 3-}$ cyclopentadiene, that is, it consists of a cyclic compound having five carbon atoms and two double bonds between the first, second and the third, fourth carbon atoms. A methyl group is present as a substituent on the second carbon atom. Therefore, the structure of $\text{2-methyl-1, 3-cyclopentadiene}$ is given below.

Figure 5

Conclusion

The structural formula of the given compound is shown in figure 5.

Interpretation Introduction

(f)

Interpretation:

The structural formula for the given compound is to be drawn.

Concept introduction:

The systematic naming of organic compound is given by IUPAC nomenclature. The naming of organic compound is done such that the structure of organic compound is correctly interpreted from the name.

Rules for writing IUPAC name from structural formula are:

• First identify the longest carbon chain.

• The next step is to identify the groups attached to the longest chain.

• Identify the position, location, and number of the substituents bonded to the carbon chain.

• Use prefix di, tri, tetra if same type of substituents are present.

• Name the substituents in alphabetical order.

Answer to Problem 12.7E

The structural formula for the given compound is shown below.

Explanation of Solution

The given compound is $\text{3-}$sec$\text{-butyl-3-}t\text{-butyl-1-heptyne}$. The parent chain is $\text{1-heptyne}$, that is, it consists of a carbon chain having seven carbon atoms and a triple bond between the first and the second carbon atoms. A sec-butyl group and a t-butyl group is present as a substituent on the third carbon atom. Therefore, the structure of $\text{3-}$sec$\text{-butyl-3-}t\text{-butyl-1-heptyne}$ is given below.

Figure 6

Conclusion

The structural formula of the given compound is shown in figure 6.