Which is a trimer of ethyne?
Correct answer: B. Benzene
- A. PVC
- B. Benzene
- C. Toluene
- D. Teflon
Explanation
Benzene is formed by the cyclic trimerization of three ethyne (acetylene) molecules in a chemical process that rearranges the atoms into a stable aromatic ring. Each ethyne molecule contributes two carbon atoms, resulting in the six-carbon structure of benzene. The other options, PVC, toluene, and Teflon, are not formed from ethyne or its derivatives: PVC is derived from vinyl chloride, toluene is a methyl-substituted benzene, and Teflon is a polymer of tetrafluoroethylene.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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About Benzene and Aromatic Compounds
Benzene has a planar ring of delocalised π electrons, giving aromatic stability and equal carbon-carbon bond lengths. The topic covers resonance, electrophilic substitution reactions such as nitration, halogenation, sulphonation and Friedel-Crafts reactions, along with substituent effects and the distinction between substitution in benzene and addition in ordinary alkenes.
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