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Which structure is NOT aromatic? H3C B- ODO

Which structure is NOT aromatic? H3C B- ODO

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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### Which structure is NOT aromatic? This is a chemistry multiple-choice question discussing the aromaticity of molecular structures. The question asks to identify which given structure is not aromatic. Here are the details of each option provided: 1. **First Structure**: - Label: Benzene ring with a methyl group (CH₃) attached to a boron atom (B). - Description: A six-membered carbon ring (benzene) with alternating double bonds. Attached to one carbon is a boron atom with a methyl group attached to the boron. 2. **Second Structure**: - Label: Triangle with a "+ " inside (a cyclopropenium ion). - Description: A three-membered carbon ring (triangle) with a positive charge (denoted by "+" inside the ring). 3. **Third Structure**: - Label: Furan (five-membered ring with one oxygen atom). - Description: A five-membered carbon ring with four carbon atoms, one oxygen atom with lone pairs, and alternating double bonds. 4. **Fourth Structure**: - Label: Bromocyclopentadienyl cation (five-membered ring with a bromine atom). - Description: A five-membered carbon ring with alternating double bonds and a bromine atom with lone pairs, alongside a positive charge indicated near the bromine. Each structure has specific characteristics that determine whether it is aromatic or not, based on Hückel's rule (4n+2 π electrons). Aromatic compounds are cyclic, planar, fully conjugated with alternating π electrons, and adhere to Hückel's rule. The task is to determine which of these structures does not meet all criteria for aromaticity.
Transcribed Image Text:### Which structure is NOT aromatic? This is a chemistry multiple-choice question discussing the aromaticity of molecular structures. The question asks to identify which given structure is not aromatic. Here are the details of each option provided: 1. **First Structure**: - Label: Benzene ring with a methyl group (CH₃) attached to a boron atom (B). - Description: A six-membered carbon ring (benzene) with alternating double bonds. Attached to one carbon is a boron atom with a methyl group attached to the boron. 2. **Second Structure**: - Label: Triangle with a "+ " inside (a cyclopropenium ion). - Description: A three-membered carbon ring (triangle) with a positive charge (denoted by "+" inside the ring). 3. **Third Structure**: - Label: Furan (five-membered ring with one oxygen atom). - Description: A five-membered carbon ring with four carbon atoms, one oxygen atom with lone pairs, and alternating double bonds. 4. **Fourth Structure**: - Label: Bromocyclopentadienyl cation (five-membered ring with a bromine atom). - Description: A five-membered carbon ring with alternating double bonds and a bromine atom with lone pairs, alongside a positive charge indicated near the bromine. Each structure has specific characteristics that determine whether it is aromatic or not, based on Hückel's rule (4n+2 π electrons). Aromatic compounds are cyclic, planar, fully conjugated with alternating π electrons, and adhere to Hückel's rule. The task is to determine which of these structures does not meet all criteria for aromaticity.
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