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Questions and Answers
What is the largest single constituent of coal-tar?
What is the largest single constituent of coal-tar?
- Phenanthrene
- Naphthalene (correct)
- Methane
- Anthracene
Which of the following is a fused or condensed aromatic hydrocarbon?
Which of the following is a fused or condensed aromatic hydrocarbon?
- Methanol
- Naphthalene (correct)
- Ethanol
- Propane
What is used to remove acidic impurities during the purification of naphthalene?
What is used to remove acidic impurities during the purification of naphthalene?
- Hydrochloric acid
- Sodium hydroxide (correct)
- Water
- Dilute sulfuric acid
How is naphthalene obtained from the middle oil fraction?
How is naphthalene obtained from the middle oil fraction?
In naming derivatives of naphthalene, what numbering system is used?
In naming derivatives of naphthalene, what numbering system is used?
What is the most important member of the class of fused or condensed aromatic hydrocarbons?
What is the most important member of the class of fused or condensed aromatic hydrocarbons?
How is naphthalene obtained from the middle oil fraction?
How is naphthalene obtained from the middle oil fraction?
Which aromatic hydrocarbon contains two pairs of carbon atoms shared by two rings?
Which aromatic hydrocarbon contains two pairs of carbon atoms shared by two rings?
What is used to remove basic impurities during the purification of naphthalene?
What is used to remove basic impurities during the purification of naphthalene?
What is the alternative nomenclature system used when there is only one substituent on the naphthalene skeleton?
What is the alternative nomenclature system used when there is only one substituent on the naphthalene skeleton?
How is naphthalene obtained from the middle oil fraction?
How is naphthalene obtained from the middle oil fraction?
What is used to remove acidic impurities during the purification of naphthalene?
What is used to remove acidic impurities during the purification of naphthalene?
What is the largest single constituent of coal-tar?
What is the largest single constituent of coal-tar?
In naming derivatives of naphthalene, what numbering system is used?
In naming derivatives of naphthalene, what numbering system is used?
Which aromatic hydrocarbon contains two pairs of carbon atoms shared by two rings?
Which aromatic hydrocarbon contains two pairs of carbon atoms shared by two rings?
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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.
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