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Ch. 2 - General Chemistry Translated: Finding the Electrons
Mullins - Organic Chemistry: A Learner Centered Approach 1st Edition
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471Not the one you use?Change textbook
Chapter 1, Problem 67a

Identify the resonance structure that will be produced given the molecule shown and the electron flow indicated.
(a) Diagram showing a molecule with indicated electron flow and arrows to identify resonance structures.

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1
Step 1: Understand the concept of resonance structures. Resonance structures are different ways of drawing the same molecule to represent delocalized electrons. They are connected by curved arrows that show the movement of electrons.
Step 2: Analyze the molecule provided. Look at the electron flow indicated by the curved arrows. These arrows typically show the movement of π-electrons or lone pairs to form new bonds or shift charges.
Step 3: Apply the electron flow to redraw the molecule. Follow the curved arrows to determine where the electrons are moving. For example, if a lone pair moves to form a π-bond, adjust the structure accordingly.
Step 4: Ensure that the new resonance structure obeys the rules of resonance. These include maintaining the same number of valence electrons, ensuring all atoms follow the octet rule (if applicable), and avoiding structures with unreasonable charges.
Step 5: Verify the resonance structure. Confirm that the new structure is valid and represents the same molecule, just with a different electron distribution. Resonance structures do not change the connectivity of atoms, only the placement of electrons.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Resonance Structures

Resonance structures are different Lewis structures for the same molecule that depict the same arrangement of atoms but differ in the placement of electrons. These structures help illustrate the delocalization of electrons within a molecule, which can stabilize it. The actual structure of the molecule is a hybrid of all possible resonance forms, contributing to its overall stability and reactivity.
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Electron Flow

Electron flow refers to the movement of electrons during chemical reactions, particularly in the context of nucleophilic and electrophilic interactions. Understanding how electrons are transferred or shared between atoms is crucial for predicting the formation of resonance structures. This flow is often represented using arrows in reaction mechanisms, indicating the direction of electron movement.
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Delocalization

Delocalization is the phenomenon where electrons are spread over several atoms rather than being localized between two atoms. In resonance structures, delocalization allows for the stabilization of the molecule by lowering its energy. This concept is essential for understanding the behavior of conjugated systems and aromatic compounds, where electrons can move freely across multiple bonds.
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