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FAQs on Aromaticity of Fulvenes - Chemistry Optional Notes for UPSC

1. What is aromaticity in the context of fulvenes?
Ans. Aromaticity refers to the property of certain organic compounds, such as fulvenes, that exhibit exceptional stability due to the presence of a conjugated cyclic system of pi-electrons.
2. How is aromaticity determined in fulvenes?
Ans. Aromaticity in fulvenes can be determined by analyzing their electronic structure and molecular orbital interactions using various computational methods, such as density functional theory (DFT) calculations.
3. What are the factors that contribute to aromaticity in fulvenes?
Ans. The factors contributing to aromaticity in fulvenes include the presence of a cyclic conjugated system, planarity of the molecule, and the number of pi-electrons in the system following Huckel's rule (4n+2 pi-electrons).
4. How does aromaticity affect the chemical properties of fulvenes?
Ans. Aromaticity in fulvenes enhances their stability and influences their reactivity. Aromatic fulvenes are relatively unreactive and less prone to undergo addition or substitution reactions compared to non-aromatic compounds.
5. Can fulvenes exhibit antiaromaticity?
Ans. Yes, it is possible for fulvenes to exhibit antiaromaticity. Anti-aromatic fulvenes are characterized by cyclic conjugated systems with a total number of pi-electrons following Huckel's rule (4n pi-electrons), which results in decreased stability and increased reactivity.
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