Skip to main content
Ch. 23 - Benzene 1: Aromatic Stability and Substitution Reactions
Mullins - Organic Chemistry: A Learner Centered Approach 1st Edition
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoMullins 1st EditionCh. 23 - Benzene 1: Aromatic Stability and Substitution ReactionsProblema 61i
Capitolo 22, Problema 61i

(i) Classify the following molecules as aromatic, nonaromatic, or antiaromatic.
(ii) For aromatic molecules, solve for n in Hückel’s rule. For all other molecules, explain which rule of aromaticity is being broken.
(i) Two interconnected hexagonal carbon rings with alternating double bonds, representing a molecular structure for classification.

Guida verificata passo dopo passo
1
Identify the molecule: The structure shown is naphthalene, which consists of two fused benzene rings.
Determine the number of π-electrons: Each benzene ring contributes 6 π-electrons, so naphthalene has a total of 10 π-electrons.
Apply Hückel's rule: For a molecule to be aromatic, it must have (4n + 2) π-electrons, where n is a non-negative integer.
Solve for n in Hückel's rule: Set 4n + 2 = 10 and solve for n. This will help determine if the molecule is aromatic.
Conclude the classification: If n is a whole number, the molecule is aromatic. If not, consider if the molecule is nonaromatic or antiaromatic based on its structure and electron count.

Concetti chiave

Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.

Aromaticity

Aromaticity is a property of cyclic, planar structures with a ring of resonance bonds that leads to enhanced stability. For a molecule to be aromatic, it must follow Hückel's rule, which requires a conjugated system with (4n + 2) π electrons, where n is a non-negative integer. This rule helps determine the electron count needed for aromatic stability.
Video consigliato:
08:19
Intro to Aromaticity

Hückel's Rule

Hückel's rule is a criterion used to determine if a planar ring molecule is aromatic. It states that a molecule is aromatic if it has (4n + 2) π electrons, where n is a non-negative integer. This rule is crucial for identifying aromatic compounds, as it explains the electron configuration that contributes to the molecule's stability and reactivity.
Video consigliato:
03:54
The 18 and 16 Electron Rule

Antiaromaticity and Nonaromaticity

Antiaromatic compounds are cyclic, planar, and have a conjugated system, but they contain 4n π electrons, leading to instability. Nonaromatic compounds lack one or more of the criteria for aromaticity, such as planarity or a fully conjugated system. Understanding these distinctions helps classify molecules and predict their chemical behavior.
Video consigliato:
02:58
Determine the aromaticity
Pratica correlata
Domanda del libro di testo

(i) Classify the following molecules as aromatic, nonaromatic, or antiaromatic.

(ii) For aromatic molecules, solve for n in Hückel’s rule. For all other molecules, explain which rule of aromaticity is being broken.

(h)

444
views
Domanda del libro di testo

Use a Frost circle diagram to construct the molecular orbital diagram for the molecules shown. Would you expect them to be aromatic or antiaromatic?

(a)

417
views
Domanda del libro di testo

Use a Frost circle diagram to construct the molecular orbital diagram for the molecules shown. Would you expect them to be aromatic or antiaromatic?

(c)

426
views
Domanda del libro di testo

Use a Frost circle diagram to construct the molecular orbital diagram for the molecules shown. Would you expect them to be aromatic or antiaromatic?

(b) 

788
views
Domanda del libro di testo

(i) Classify the following molecules as aromatic, nonaromatic, or antiaromatic.

(ii) For aromatic molecules, solve for n in Hückel’s rule. For all other molecules, explain which rule of aromaticity is being broken.

(g)

451
views
Domanda del libro di testo

(i) Classify the following molecules as aromatic, nonaromatic, or antiaromatic.

(ii) For aromatic molecules, solve for n in Hückel’s rule. For all other molecules, explain which rule of aromaticity is being broken.

(f)

489
views