Chapter 12, Problem 12.4E

Interpretation Introduction

(a)

Interpretation:

The IUPAC name for the compound is to be stated.

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 shown below.

• 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 12.4E

The name of compound is $\text{but-2-ene}$.

Explanation of Solution

The compound is given as ${\text{CH}}_{\text{3}}\text{CH}={\text{CHCH}}_{\text{3}}$. The parent chain is butene, that is, it consists of four carbon atoms and a double bond between the second and the third carbon atoms as shown below.

Figure 1

Therefore, the name of the compound is $\text{but-2-ene}$.

Conclusion

The name of compound is $\text{but-2-ene}$.

Interpretation Introduction

(b)

Interpretation:

The IUPAC name for compound is to be stated.

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 shown below.

• 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 12.4E

The name of the given compound is $\text{3-ethyl-pent-2-ene}$.

Explanation of Solution

The compound is given as shown below.

Figure 2

The parent chain is pentene, that is, it consists of five carbon atoms and a double bond between the second and the third carbon atoms. An ethyl group is present as a substituent on the third carbon atom as shown below.

Figure 3

Therefore, the name of compound is $\text{3-ethyl-pent-2-ene}$.

Conclusion

The name of compound is $\text{3-ethyl-pent-2-ene}$.

Interpretation Introduction

(c)

Interpretation:

The IUPAC name for the given compound is to be stated.

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 shown below.

• 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 12.4E

The name of compound is $\text{4, 4-dimethyl-hex-2-yne}$.

Explanation of Solution

The compound is given as shown below.

Figure 4

The parent chain is hexyne, that is, it consists of six carbon atoms and a triple bond between the second and the third carbon atoms. Two methyl groups are present as a substituent on the fourth carbon atom as shown below.

Figure 5

Therefore, the name of compound is $\text{4, 4-dimethyl-hex-2-yne}$.

Conclusion

The name of compound is $\text{4, 4-dimethyl-hex-2-yne}$.

Interpretation Introduction

(d)

Interpretation:

The IUPAC name for the given compound is to be stated.

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 shown below.

• 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 12.4E

The name of compound is $\text{4-methyl-cyclopent-1-ene}$.

Explanation of Solution

The compound is given as shown below.

Figure 6

The parent chain is cyclopentene, that is, it consists of five 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 as shown below.

Figure 7

Therefore, the name of compound is $\text{4-methyl-cyclopent-1-ene}$.

Conclusion

The name of compound is $\text{4-methyl-cyclopent-1-ene}$.

Interpretation Introduction

(e)

Interpretation:

The IUPAC name for compound is to be stated.

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 shown below.

• 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 12.4E

The name of compound is $\text{6-bromo-2-methyl-hept-3-yne}$.

Explanation of Solution

The compound is given as shown below.

Figure 8

The parent chain is heptyne, that is, it consists of seven carbon atoms and a triple bond between the third and the fourth carbon atoms. A methyl group and a bromine group are present as substituents on the second and the sixth carbon atoms respectively as shown below.

Figure 9

Therefore, the name of the given compound is $\text{6-bromo-2-methyl-hept-3-yne}$.

Conclusion

The name of compound is $\text{6-bromo-2-methyl-hept-3-yne}$.

Interpretation Introduction

(f)

Interpretation:

The IUPAC name for the given compound is to be stated.

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 shown below.

• 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 12.4E

The name of compound is $\text{1-ethyl-2, 3-dimethylcycloprop-1-ene}$.

Explanation of Solution

The compound is given as shown below.

Figure 10

The parent chain is cyclopropene, that is, it consists of three carbon atoms and a double bond between the first and the second carbon atoms. An ethyl group and two methyl groups are present as a substituent on the first, second and the third carbon atoms respectively as shown below.

Figure 11

Therefore, the name of compound is $\text{1-ethyl-2, 3-dimethylcycloprop-1-ene}$.

Conclusion

The name of compound is $\text{1-ethyl-2, 3-dimethylcycloprop-1-ene}$.

Interpretation Introduction

(g)

Interpretation:

The IUPAC name for compound is to be stated.

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 shown below.

• 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 12.4E

The name of compound is $\text{6-methyl-hepta-2, 4-diene}$.

Explanation of Solution

The compound is given as shown below.

Figure 12

The parent chain is heptadiene, that is, it consists of seven carbon atoms and double bonds between the first, second and the fourth, fifth carbon atoms. A methyl group is present as a substituent on the sixth carbon atom as shown below.

Figure 13

Therefore, the name of compound is $\text{6-methyl-hepta-2, 4-diene}$.

Conclusion

The name of compound is $\text{6-methyl-hepta-2, 4-diene}$.