Chapter 18, Problem 28PP

(a)

Interpretation Introduction

Interpretation: For the given compounds, IUPAC name should be provided.

Concept introduction:

For naming and the polysubstituted benzene ring, following steps should be followed.

1. 1. Identify and name the parent
2. 2. Identify and name the substituent
3. 3. Assign a locant to each substituent
4. 4. Arrange the substituent alphabetically

Answer to Problem 28PP

• Name for the given compound

           

             4-ethylbenzoic acid

Explanation of Solution

  4-ethylbenzoic acid

From the structure of the compound it is clear that the parent group is benzoic acid.

The second step to name the structure of the polysubstituted benzene ring is

Identification of substituent and its locant at the lowest possible number, for the given compound an ethyl group is a substituent and it is placed to the 4^th ( ${\text{C}}_{\text{4}}$) position of benzoic acid. So for naming the compound, name of substituent with locant by an alphabetic order should be assigned firstly and the name of the parent will become at the end. So the given compound name is 4-ethylbenzoic acid

(b)

Interpretation Introduction

Interpretation: For the given compounds, IUPAC name should be provided.

Concept introduction:

For naming and the polysubstituted benzene ring, following steps should be followed.

1. 5. Identify and name the parent
2. 6. Identify and name the substituent
3. 7. Assign a locant to each substituent
4. 8. Arrange the substituent alphabetically

Answer to Problem 28PP

• Name for the given compound

  b)

•    

    2-bromophenol

Explanation of Solution

The given compound b2-bromophenol

From the structure of the compound it is clear that the parent group is phenol.

The second step to name the structure of the polysubstituted benzene ring is

Identification of substituent and its locant at the lowest possible number. For the given compound bromine atom is a substituent and they are placed to the 2^nd ( ${\text{C}}_2$) position of phenol. So for naming the compound, name of substituent with locant by an alphabetic order should be assigned firstly and the name of the parent will become at the end. So the given compound name is 2-bromophenol

(c)

Interpretation Introduction

Interpretation: For the given compounds, IUPAC name should be provided.

Concept introduction:

For naming and the polysubstituted benzene ring, following steps should be followed.

1. 9. Identify and name the parent
2. 10. Identify and name the substituent
3. 11. Assign a locant to each substituent
4. 12. Arrange the substituent alphabetically

Answer to Problem 28PP

• Name for the given compound

      

       2-chloro-4-nitrophenol

Explanation of Solution

The given compound c

2-chloro-4-nitrophenol

From the structure of the compound it is clear that the parent group is phenol.

The second step to name the structure of the polysubstituted benzene ring is

Identification of substituent and its locant at the lowest possible number. For the given compound a chlorine atom and nitro group are substituent and they are placed to the 2^nd ( ${\text{C}}_2$) and 4^th ( ${\text{C}}_4$) positions of phenol respectively. So for naming the compound, name of substituent with locant by an alphabetic order should be assigned firstly and the name of the parent will become at the end. So the given compound name is 2-chloro-4-nitrophenol

(d)

Interpretation Introduction

Interpretation: For the given compounds, IUPAC name should be provided.

Concept introduction:

For naming and the polysubstituted benzene ring, following steps should be followed.

1. 13. Identify and name the parent
2. 14. Identify and name the substituent
3. 15. Assign a locant to each substituent
4. 16. Arrange the substituent alphabetically

Answer to Problem 28PP

• Name for the given compound

  d)

  

  2-bromo-5-nitrobenzaldehyde

Explanation of Solution

The given compound d

2-bromo-5-nitrobenzaldehyde

From the structure of the compound it is clear that the parent group is benzaldehyde.

The second step to name the structure of the polysubstituted benzene ring is

Identification of substituent and its locant at the lowest possible number. For the given compound a bromine atom and nitro group are substituent and they are placed to the 2^nd ( ${\text{C}}_2$) and 5^th ( ${\text{C}}_5$) positions of benzaldehyde respectively. So for naming the compound, name of substituent with locant by an alphabetic order should be assigned firstly and the name of the parent will become at the end. So the given compound name is 2-bromo-5-nitrobenzaldehyde

(e)

Interpretation Introduction

Interpretation: For the given compounds, IUPAC name should be provided.

Concept introduction:

For naming and the polysubstituted benzene ring, following steps should be followed.

1. 17. Identify and name the parent
2. 18. Identify and name the substituent
3. 19. Assign a locant to each substituent
4. 20. Arrange the substituent alphabetically

Answer to Problem 28PP

• Name for the given compound

• 

  1, 4-diisopropylbenzene

Explanation of Solution

The given compound e

1, 4-diisopropylbenzene

From the structure of the compound it is clear that the parent group is benzene.

The second step to name the structure of the polysubstituted benzene ring is

Identification of substituent and its locant at the lowest possible number. For the given compound there are two substituents, both isopropyl group it is placed to the 1^st ( ${\text{C}}_1$) and 4^th ( ${\text{C}}_4$) positions of   benzene. So for naming the compound, name of substituent with locant by an alphabetic order should be assigned firstly and the name of the parent will become at the end. So the given compound name is 2-chloro-4-nitrophenol