15 Questions
What is the largest single constituent of coal-tar?
Naphthalene
Which of the following is a fused or condensed aromatic hydrocarbon?
Naphthalene
What is used to remove acidic impurities during the purification of naphthalene?
Sodium hydroxide
How is naphthalene obtained from the middle oil fraction?
By chilling and subsequent purification
In naming derivatives of naphthalene, what numbering system is used?
$1, 2$ numbering system
What is the most important member of the class of fused or condensed aromatic hydrocarbons?
Naphthalene
How is naphthalene obtained from the middle oil fraction?
By chilling the middle oil fraction and subsequent purification processes
Which aromatic hydrocarbon contains two pairs of carbon atoms shared by two rings?
Anthracene
What is used to remove basic impurities during the purification of naphthalene?
Dilute sulfuric acid
What is the alternative nomenclature system used when there is only one substituent on the naphthalene skeleton?
$1,2$-naming system
How is naphthalene obtained from the middle oil fraction?
By chilling the middle oil fraction and then washing it successively with dilute sulfuric acid, sodium hydroxide, and water
What is used to remove acidic impurities during the purification of naphthalene?
Sodium hydroxide
What is the largest single constituent of coal-tar?
Naphthalene
In naming derivatives of naphthalene, what numbering system is used?
$1, 6$-numbering system
Which aromatic hydrocarbon contains two pairs of carbon atoms shared by two rings?
Anthracene
Study Notes
Naphthalene and Coal-Tar
- Naphthalene is the largest single constituent of coal-tar.
- Naphthalene is a fused or condensed aromatic hydrocarbon.
Purification of Naphthalene
- Acidic impurities are removed during the purification of naphthalene using sodium hydroxide.
- Basic impurities are removed during the purification of naphthalene using sulphuric acid.
Obtaining Naphthalene
- Naphthalene is obtained from the middle oil fraction through fractional distillation.
Nomenclature of Naphthalene Derivatives
- The peripheral numbering system is used to name derivatives of naphthalene.
- The alternative nomenclature system used when there is only one substituent on the naphthalene skeleton is the ortho-meta-para system.
Characteristics of Naphthalene
- Naphthalene is the most important member of the class of fused or condensed aromatic hydrocarbons.
- It contains two pairs of carbon atoms shared by two rings.
Test your knowledge of fused or condensed aromatic hydrocarbons containing more than one ring, such as naphthalene, anthracene, and phenanthrene. Learn about the structures and properties of these important members of aromatic hydrocarbons.
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