Textbook Question
Draw resonance contributors for each of the following species and rank them in order of decreasing contribution to the resonance hybrid. Then draw the resonance hybrid.
b.
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1. A Review of General Chemistry
Resonance Structures
6:30 minutesProblem 61a,b,c
Textbook Question
Which of the following has delocalized electrons?
a. 
b. 
c. 
Verified step by step guidance1
Step 1: Understand the concept of delocalized electrons. Delocalized electrons are electrons that are not associated with a single atom or a single covalent bond. Instead, they are spread out over multiple atoms, typically in a conjugated π-system or within a resonance structure.
Step 2: Identify the structural features that allow for delocalization. Look for conjugated systems, which are alternating single and double bonds, or resonance structures where electrons can move between atoms.
Step 3: Analyze each option (a, b, c) to determine if it contains a conjugated π-system or resonance structures. For example, check if there are alternating double and single bonds or lone pairs that can participate in resonance.
Step 4: Use resonance structures to confirm delocalization. Draw possible resonance forms for each option to see if electrons can be delocalized across multiple atoms.
Step 5: Based on the analysis, identify which option(s) have delocalized electrons. Ensure that the structure satisfies the criteria for delocalization, such as the presence of a conjugated system or resonance stabilization.
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Video duration:
6mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Delocalized Electrons
Delocalized electrons are electrons that are not confined to a single atom or bond but are spread over multiple atoms. This phenomenon occurs in molecules with conjugated systems or resonance structures, where the electron density is shared among several atoms, leading to increased stability and unique chemical properties.
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Resonance Structures
Resonance structures are different ways of drawing the same molecule that illustrate the delocalization of electrons. These structures help to represent the actual electron distribution more accurately, as the true structure is a hybrid of all possible resonance forms, contributing to the molecule's stability and reactivity.
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Conjugation
Conjugation refers to the overlap of p-orbitals across adjacent double or triple bonds, allowing for the delocalization of electrons. This arrangement enhances the stability of the molecule and can affect its color, reactivity, and other physical properties, making it a key concept in understanding organic compounds.
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