Which of the following molecules is aromatic. Our teacher says the answer is c bc it’s a heterocyclic aromatic.

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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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W: Which of the following molecules is aromatic. Our teacher says the answer is c bc it’s a heterocyclic aromatic. Can someone explain why C was not the answer then as well. They both have 2 double bonds so I can’t figure out what’s different t them
**Chemical Structures and Nomenclature**

Here we present five different chemical structures labeled A through E. Each structure depicts a unique cyclic compound with various elements and charges indicated. Below each structure, they are assigned a letter for reference:

- **Structure A**: A five-membered ring with a positive charge in a corner; likely indicates a cationic species.
  
- **Structure B**: A five-membered carbon ring with alternating single and double bonds; this is a conjugated system resembling cyclopentadiene.

- **Structure C**: A six-membered heterocyclic ring with an oxygen atom; two double bonds are present, indicating a furan-type structure.

- **Structure D**: A three-membered triangle with a negative charge at one vertex, suggesting a silacyclopropenylide anion.

- **Structure E**: A five-membered ring with a sulfur atom; this indicates a thiophene-like compound.

Choices are presented below the structures for identification:

- a) A
- b) B
- c) C
- d) D
- e) E
Transcribed Image Text:**Chemical Structures and Nomenclature** Here we present five different chemical structures labeled A through E. Each structure depicts a unique cyclic compound with various elements and charges indicated. Below each structure, they are assigned a letter for reference: - **Structure A**: A five-membered ring with a positive charge in a corner; likely indicates a cationic species. - **Structure B**: A five-membered carbon ring with alternating single and double bonds; this is a conjugated system resembling cyclopentadiene. - **Structure C**: A six-membered heterocyclic ring with an oxygen atom; two double bonds are present, indicating a furan-type structure. - **Structure D**: A three-membered triangle with a negative charge at one vertex, suggesting a silacyclopropenylide anion. - **Structure E**: A five-membered ring with a sulfur atom; this indicates a thiophene-like compound. Choices are presented below the structures for identification: - a) A - b) B - c) C - d) D - e) E
Expert Solution
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Aromatic compounds are those compounds which follow (4n+2)π Huckel's rule. 

 

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