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10. Which of the following heterocycles is not aromatic? N. N. II IV A. Ι В. I C. II D. IV

10. Which of the following heterocycles is not aromatic? N. N. II IV A. Ι В. I C. II D. IV

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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**Question:** 10. Which of the following heterocycles is not aromatic? **Options:** - **A. I** - Structure: A five-membered ring with four carbons and one oxygen atom (furan). - **B. II** - Structure: A six-membered ring with five carbons and one nitrogen atom (pyridine). - **C. III** - Structure: A six-membered ring with four carbons, one nitrogen atom, and one oxygen atom (dioxane). - **D. IV** - Structure: A six-membered ring with three carbons and three nitrogen atoms (1,2,3-triazine). **Explanation:** The question asks which of the given heterocyclic compounds is not aromatic. To determine aromaticity, a compound must satisfy Huckel's rule and have a planar, cyclic structure with a conjugated system of π-electrons. The structure labeled "III" is dioxane, which does not satisfy these criteria for aromaticity, as it does not possess the necessary delocalized π-electron cloud across the ring.
Transcribed Image Text:**Question:** 10. Which of the following heterocycles is not aromatic? **Options:** - **A. I** - Structure: A five-membered ring with four carbons and one oxygen atom (furan). - **B. II** - Structure: A six-membered ring with five carbons and one nitrogen atom (pyridine). - **C. III** - Structure: A six-membered ring with four carbons, one nitrogen atom, and one oxygen atom (dioxane). - **D. IV** - Structure: A six-membered ring with three carbons and three nitrogen atoms (1,2,3-triazine). **Explanation:** The question asks which of the given heterocyclic compounds is not aromatic. To determine aromaticity, a compound must satisfy Huckel's rule and have a planar, cyclic structure with a conjugated system of π-electrons. The structure labeled "III" is dioxane, which does not satisfy these criteria for aromaticity, as it does not possess the necessary delocalized π-electron cloud across the ring.
**Question 9: What is the correct structure for para-bromotoluene?** In the given problem, four chemical structures are presented to identify the correct one for para-bromotoluene. - **Structure I**: This diagram shows a benzene ring with a bromine (Br) atom and a methyl (CH₃) group attached. The groups are 1,4-disubstituted, indicating a para position. - **Structure II**: This diagram depicts a benzene ring with a methoxy (MeO) group and a bromine (Br) atom attached. The positioning is ortho, with both groups directly adjacent. - **Structure III**: This diagram shows a benzene ring with a bromine (Br) atom and a methoxy (MeO) group, arranged in a different position from Structure II. - **Structure IV**: This diagram exhibits a benzene ring with a bromine (Br) atom and an isopropyl group, not relevant for para-bromotoluene. The correct answer is **A. I**, where the methyl (CH₃) group and the bromine (Br) atom are situated opposite each other on the benzene ring, typical for para substitution.
Transcribed Image Text:**Question 9: What is the correct structure for para-bromotoluene?** In the given problem, four chemical structures are presented to identify the correct one for para-bromotoluene. - **Structure I**: This diagram shows a benzene ring with a bromine (Br) atom and a methyl (CH₃) group attached. The groups are 1,4-disubstituted, indicating a para position. - **Structure II**: This diagram depicts a benzene ring with a methoxy (MeO) group and a bromine (Br) atom attached. The positioning is ortho, with both groups directly adjacent. - **Structure III**: This diagram shows a benzene ring with a bromine (Br) atom and a methoxy (MeO) group, arranged in a different position from Structure II. - **Structure IV**: This diagram exhibits a benzene ring with a bromine (Br) atom and an isopropyl group, not relevant for para-bromotoluene. The correct answer is **A. I**, where the methyl (CH₃) group and the bromine (Br) atom are situated opposite each other on the benzene ring, typical for para substitution.
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