Podcast
Questions and Answers
How many carbons and hydrogens are present in naphthalene?
How many carbons and hydrogens are present in naphthalene?
- 10 carbons, 8 hydrogens (correct)
- 8 carbons, 10 hydrogens
- 7 carbons, 9 hydrogens
- 12 carbons, 6 hydrogens
What is the common short-hand representation of naphthalene?
What is the common short-hand representation of naphthalene?
- C10H8 (correct)
- C10H10
- C8H10
- C12H6
According to resonance theory, naphthalene is considered to be a hybrid of how many forms?
According to resonance theory, naphthalene is considered to be a hybrid of how many forms?
- 4 forms
- 3 forms (correct)
- 2 forms
- 5 forms
Why is naphthalene considered less aromatic and more reactive than benzene?
Why is naphthalene considered less aromatic and more reactive than benzene?
What is the bond length between carbon atoms C₁ and C₂ in naphthalene?
What is the bond length between carbon atoms C₁ and C₂ in naphthalene?
What is the product formed when petroleum fractions are passed over copper catalyst at 680°C?
What is the product formed when petroleum fractions are passed over copper catalyst at 680°C?
How are methyl naphthalenes further converted into naphthalene?
How are methyl naphthalenes further converted into naphthalene?
What product is obtained when 4-butene is passed over red hot calcium oxide?
What product is obtained when 4-butene is passed over red hot calcium oxide?
What is the name of the reaction converting methyl naphthalenes into naphthalene?
What is the name of the reaction converting methyl naphthalenes into naphthalene?
At what temperature are petroleum fractions passed over a copper catalyst to form methylnaphthaline?
At what temperature are petroleum fractions passed over a copper catalyst to form methylnaphthaline?
Study Notes
Naphthalene
- Naphthalene consists of 10 carbon atoms and 8 hydrogen atoms.
- The common shorthand representation for naphthalene is C₁₀H₈.
- According to resonance theory, naphthalene is a hybrid of three resonance forms.
- Naphthalene is considered less aromatic and more reactive than benzene because the delocalization of electrons in naphthalene is less efficient compared to benzene.
- The bond length between carbon atoms C₁ and C₂ in naphthalene is 1.39 Å.
Naphthalene Production
- Passing petroleum fractions over a copper catalyst at 680°C results in the formation of naphthalene.
- Methylnaphthalenes, a byproduct of the above process, can be further converted into naphthalene through a demethylation process.
- Passing 4-butene over red hot calcium oxide produces butadiene, a key compound in the production of synthetic rubber.
Methylnaphthalene Demethylation
- The process of converting methylnaphthalenes into naphthalene is called demethylation.
- This reaction is usually carried out at 450-550°C (842-1022°F), where the methyl groups are removed from the naphthalene molecule.
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Description
Test your knowledge on poly nuclear hydrocarbons, organic compounds composed of hydrogen and carbon in the form of multiple aromatic rings like Naphthalene, Anthracene, and Phenanthracene. Learn about the structure, composition, and preparation of Naphthalene.
