Textbook Question
(i) Classify the following molecules as aromatic, nonaromatic, or antiaromatic.
(ii) For aromatic molecules, solve for n in Hückel’s rule. For all other molecules, explain which rule of aromaticity is being broken.
(c)
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18. Aromaticity
Aromatic Hydrocarbons
Multiple Choice
Which of the following is primarily composed of ?
A
Clothing
B
Polyvinyl chloride
C
Barbeque fuel
D
Pain relievers
Verified step by step guidance1
Step 1: Understand what aromatic hydrocarbons are. Aromatic hydrocarbons are organic compounds that contain one or more benzene rings or similar conjugated ring systems with delocalized π-electrons, which provide special stability and unique chemical properties.
Step 2: Analyze each option to determine if it primarily consists of aromatic hydrocarbons. Clothing is typically made from natural fibers (like cotton) or synthetic polymers (like polyester), which are not primarily aromatic hydrocarbons.
Step 3: Polyvinyl chloride (PVC) is a polymer made from vinyl chloride monomers and does not contain aromatic rings; it is an aliphatic polymer.
Step 4: Barbecue fuel, such as charcoal or certain types of lighter fluids, often contains aromatic hydrocarbons like benzene derivatives or polycyclic aromatic hydrocarbons (PAHs) because they are derived from petroleum or coal tar.
Step 5: Pain relievers (like aspirin or acetaminophen) may contain aromatic rings, but they are specific organic molecules, not primarily composed of aromatic hydrocarbons as a bulk material. Therefore, the best choice for a material primarily composed of aromatic hydrocarbons is barbecue fuel.
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