Which compound amongst the following is not an aromatic compound?
The Correct Option is D
Solution and Explanation
To determine which compound is not aromatic, we need to check for the following criteria commonly associated with aromaticity:
- Planarity: The molecule must be flat, allowing delocalized π-electrons to exist over the entire ring.
- Cyclic Structure: The compound must be a closed ring of atoms.
- Complete Conjugation: The π-electrons must form a conjugated system, indicating overlap of p-orbitals continuously around the ring.
- Hückel's Rule: The compound must have (4n+2) π-electrons, where n is a non-negative integer (0, 1, 2, ...).
Examining the provided compound options, one of them does not meet these criteria:
The last compound, represented by the image, is not aromatic. Upon analysis:
- Planarity: This compound has structural elements that may prevent planarity, disrupting potential delocalization of π-electrons.
- Cyclic Structure: It may form a ring; however, structural irregularities lead to a loss in conjugation.
- Conjugation and Hückel's Rule: The disruption in planarity and incomplete overlap of p-orbitals result in the inability to satisfy the (4n+2) π-electron rule for aromatic stability.
Thus, it fails the aforementioned criteria, categorizing it as a non-aromatic compound.
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Concepts Used:
Aromatic hydrocarbon
Aromatic hydrocarbons, sometimes known as arenes, are aromatic organic molecules made up entirely of carbon and hydrogen. In aromatic compounds a benzene ring which is named after the simple aromatic chemical benzene, or a phenyl group when part of a larger structure, is the configuration of six carbon atoms.
Read More: Aromaticity
Reactions of Aromatic Hydrocarbons:
1. Aromatic Substitution Reactions
This reaction involves the replacement of one substituent on the ring of an aromatic hydrocarbon, commonly a hydrogen atom, by a different substituent group.
The common types of aromatic substitution reactions are:
- Nucleophilic aromatic substitution reactions
- Electrophilic aromatic substitution reactions
- Radical nucleophilic aromatic substitution reactions
2. Coupling Reactions
In these types of reactions, the coupling of two fragments that have a radical nature is achieved with the help of a metal catalyst