Which among these is not associated with aliphatic compounds?
Correct answer: A. They contain (4n+2)pi electrons
- A. They contain (4n+2)pi electrons
- B. Contain straight chain compounds
- C. Contain branched chain compounds
- D. Has appropriate number of H-atoms and functional groups
Explanation
Aliphatic hydrocarbons can either be straught chain or branched chain. They have appropriated number of hydrogen atoms and functional groups. However, Hückel's rule" or "4n + 2 rule." This rule is typically applied to aromatic hydrocarbons, which are a specific type of cyclic, conjugated hydrocarbons. In aromatic compounds, the π-electron systems are delocalized, providing extra stability to the molecule. The most well-known example of an aromatic hydrocarbon is benzene (C6H6), which has 6 π-electrons (n = 1), following the 4n + 2 rule: 4 * 1 + 2 = 6. For aliphatic hydrocarbons (non-aromatic hydrocarbons), such as alkanes, alkenes, and alkynes, the 4n + 2 rule does not apply because these compounds do not have a cyclic and fully conjugated π-electron system. Therefore, the rule is not relevant to aliphatic hydrocarbons.
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