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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About Fundamental Principles of Organic Chemistry
Organic chemistry begins with carbon compounds classified by carbon skeleton, saturation and functional group. Work includes identifying groups such as hydroxyl, carbonyl, carboxyl and amino, applying basic nomenclature, and distinguishing structural, geometric and optical isomers, where the same molecular formula does not necessarily mean the same structure or properties.
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