Chapter 10, Problem 32P

Give the IUPAC name for each compound.

a. b.

Interpretation Introduction

(a)

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

Concept introduction: The systematic naming of organic compound is given by IUPAC. 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

1. First identify the longest carbon chain.

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

3. Identify the position, location, and number of the substituent bonded to the carbon chain.

4. Use prefix di, tri, tetra if same type of substituent is present.

5. Name the substituents in alphabetical order.

Answer to Problem 32P

The IUPAC name for the given compound is $3,5-\text{dimethylhex}-2-\text{ene}$.

Explanation of Solution

The given compound is,

Figure 1

The ball and stick model of the compound is given. The black color ball represents the carbon atom and white color ball represent the hydrogen atom.

The numbering of carbon atoms present in the longest carbon chain is shown below.

Figure 2

The longest carbon chain has six carbon atoms. The root word used for six carbon atoms is hex and the suffix used for $\text{C}=\text{C}$ linkage is –ene. The hydrocarbons that are attached to the longest chain are called substituents and they are written as prefix in alphabetical order. One methyl substituents is attached to the third and fifth carbon atom. The double bond is present between second and third carbon atom. Thus, the IUPAC name of the given structure is $3,5-\text{dimethylhex}-2-\text{ene}$.

Conclusion

The IUPAC name for the given compound is $3,5-\text{dimethylhex}-2-\text{ene}$.

Interpretation Introduction

(b)

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

Concept introduction: The systematic naming of organic compound is given by IUPAC. 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

1. First identify the longest carbon chain.

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

3. Identify the position, location, and number of the substituent bonded to the carbon chain.

4. Use prefix di, tri, tetra if same type of substituent is present.

5. Name the substituents in alphabetical order.

Answer to Problem 32P

The IUPAC name for the given compound is $1-\left(\text{sec-butyl}\right)-2-\text{methylcyclopent}-1-\text{ene}$.

Explanation of Solution

The given compound is,

Figure 3

The ball and stick model of the compound is given. The black color ball represents the carbon atom and white color ball represent the hydrogen atom.

The numbering of carbon atoms present in the longest carbon chain is shown below.

Figure 4

The longest carbon chain has five carbon atoms. The root word used for five carbon atoms is pent and the suffix used for $\text{C}=\text{C}$ linkage is –ene. The hydrocarbons that are attached to the longest chain are called substituents and they are written as prefix in alphabetical order. One methyl substituents is attached to the second carbon atom and one secondary butyl substituents is attached to the first carbon atom. The double bond is present between first and second carbon atom. Thus, the IUPAC name of the given structure is $1-\left(\text{sec-butyl}\right)-2-\text{methylcyclopent}-1-\text{ene}$.

Conclusion

The IUPAC name for the given compound is $1-\left(\text{sec-butyl}\right)-2-\text{methylcyclopent}-1-\text{ene}$.