Chapter 19, Problem 27E

Interpretation Introduction

(a)

Interpretation:

The IUPAC name of ${\text{CH}}_{\text{3}}-\text{C}\equiv \text{C}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{3}}$ alkyne is to be stated.

Concept introduction:

The systematic naming of organic compound is given by IUPAC nomenclature. The naming of organic compound is offered by some set of rules to provide each compound with its unique name.

Answer to Problem 27E

The IUPAC name of the alkyne, ${\text{CH}}_{\text{3}}-\text{C}\equiv \text{C}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{3}}$ is $\text{2-pentyne}$.

Explanation of Solution

The rules for getting the IUPAC name of alkynes are shown below step by step.

Step-1: Find the longest carbon chain containing the functional group.

The given compound is a straight chain compound, so, the full chain will be the longest chain as shown below.

${\text{CH}}_{\text{3}}-\text{C}\equiv \text{C}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{3}}$

Step-2: Give the numbering to the chain so that the functional group gets the shortest possible number as shown below.

Figure 1

Step-3: Start naming the compound with proper suffix and prefix.

The given compound contains a five-carbon atom parent chain. The functional group alkyne is present in between carbon number two and three.

For alkynes the suffix used is “yne” and naming for five carbon atoms parent chain is “pent”.

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

Conclusion

The IUPAC name is $\text{2-pentyne}$ of the compound, ${\text{CH}}_{\text{3}}-\text{C}\equiv \text{C}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{3}}$.

Interpretation Introduction

(b)

Interpretation:

The IUPAC name of the $\text{CH}\equiv \text{C}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{3}}$ alkyne compound is to be stated.

Concept introduction:

The systematic naming of organic compound is given by IUPAC nomenclature. The naming of organic compound is offered by some set of rules to provide each compound with its unique name.

Answer to Problem 27E

The IUPAC name of the alkyne $\text{CH}\equiv \text{C}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{3}}$ is $\text{1-pentyne}$.

Explanation of Solution

The rules for getting the IUPAC name of alkynes are shown below step by step.

Step-1: Find the longest carbon chain containing the functional group.

The given compound is a straight chain compound, so, the full chain will be the longest chain as shown below.

$\text{CH}\equiv \text{C}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{3}}$

Step-2: Give the numbering to the chain so that the functional group gets the shortest possible number as shown below.

Figure 2

Step-3: Start naming the compound with proper suffix and prefix.

The given compound contains a five-carbon atom parent chain. The functional group alkyne is present in between carbon number one and two.

For alkynes the suffix used is “yne” and naming for five carbon atoms parent chain is “pent”.

Therefore, the name of the compound is $\text{1-pentyne}$.

Conclusion

The IUPAC name is $\text{1-pentyne}$ of the compound, $\text{CH}\equiv \text{C}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{3}}$.

Interpretation Introduction

(c)

Interpretation:

The IUPAC name of the ${\text{CH}}_{\text{3}}-{\text{CH}}_{\text{2}}-\text{C}\equiv \text{C}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{3}}$ alkyne compound is to be stated.

Concept introduction:

The systematic naming of organic compound is given by IUPAC nomenclature. The naming of organic compound is offered by some set of rules to provide each compound with its unique name.

Answer to Problem 27E

The IUPAC name of the alkyne, ${\text{CH}}_{\text{3}}-{\text{CH}}_{\text{2}}-\text{C}\equiv \text{C}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{3}}$ is $\text{3-hexyne}$.

Explanation of Solution

The rules for getting the IUPAC name of alkynes are shown below step by step.

Step-1: Find the longest carbon chain containing the functional group.

The given compound is a straight-chain compound so the full chain will be the longest chain as shown below.

${\text{CH}}_{\text{3}}-{\text{CH}}_{\text{2}}-\text{C}\equiv \text{C}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{3}}$

Step-2: Give the numbering to the chain so that the functional group gets the shortest possible number as shown below.

Figure 3

Step-3: Start naming the compound with proper suffix and prefix.

The given compound contains a six-carbon atom parent chain. The function group alkyne is present in between carbon number three and four.

For alkynes the suffix used is “yne” and naming for six carbon atoms parent chain is “hex”.

Therefore the name of the compound is $\text{3-hexyne}$.

Conclusion

The IUPAC name is $\text{3-hexyne}$ of the compound, ${\text{CH}}_{\text{3}}-{\text{CH}}_{\text{2}}-\text{C}\equiv \text{C}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{3}}$.

Interpretation Introduction

(d)

Interpretation:

The IUPAC name of the ${\text{CH}}_{\text{3}}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{2}}-\text{C}\equiv \text{C}-{\text{CH}}_{\text{3}}$ alkyne compound is to be stated.

Concept introduction:

The systematic naming of organic compound is given by IUPAC nomenclature. The naming of organic compound is offered by some set of rules to provide each compound with its unique name.

Answer to Problem 27E

The IUPAC name of the alkyne, ${\text{CH}}_{\text{3}}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{2}}-\text{C}\equiv \text{C}-{\text{CH}}_{\text{3}}$ is $\text{2-heptyne}$.

Explanation of Solution

The rules for getting the IUPAC name of alkynes are shown below step by step.

Step-1: Find the longest carbon chain containing the functional group.

The given compound is a straight-chain compound so the full chain will be the longest chain as shown below.

${\text{CH}}_{\text{3}}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{2}}-\text{C}\equiv \text{C}-{\text{CH}}_{\text{3}}$

Step-2: Give the numbering to the chain so that the functional group gets the shortest possible number as shown below.

Figure 4

Step-3: Start naming the compound with proper suffix and prefix.

The given compound contains a seven-carbon atom parent chain. The function group alkyne is present in between carbon number two and three.

For alkynes the suffix used is “yne” and naming for seven carbon atoms parent chain is “hept”.

Therefore the name of the compound is $\text{2-heptyne}$.

Conclusion

The IUPAC name is $\text{2-heptyne}$ of the compound, ${\text{CH}}_{\text{3}}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{2}}-\text{C}\equiv \text{C}-{\text{CH}}_{\text{3}}$.