Why is Understanding Wedge-Dash Diagrams Important for Visualizing Molecules?

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Discussion Overview

The discussion centers around the importance of wedge-dash diagrams for visualizing molecular structures, particularly in the context of carbon atoms and their hybridization. Participants explore the conditions under which these diagrams are necessary and how they represent three-dimensional geometries in a two-dimensional format.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant expresses confusion about the accuracy of representations of carbon atoms in wedge-dash diagrams, questioning the validity of certain diagrams.
  • Another participant suggests that the appearance of carbon atoms should resemble a tetrahedron, prompting further inquiry into whether they do.
  • A different viewpoint emphasizes the need to determine the hybridization of carbon and whether surrounding atoms are planar or non-planar, indicating that wedge-dash projections are only necessary for non-planar arrangements.
  • Another participant provides a general explanation of wedge-dash diagrams, stating that they are a method to visualize 3D molecular geometries in 2D, and asserts that understanding tetrahedral geometry can clarify confusion regarding incorrect diagrams.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the necessity and accuracy of wedge-dash diagrams, with multiple competing views on their application and interpretation remaining evident throughout the discussion.

Contextual Notes

Some limitations include the potential dependence on definitions of hybridization and planar arrangements, as well as unresolved questions about the accuracy of specific diagrams mentioned.

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Homework Statement
I am studying stereochemistry and I cannot understand how to draw wedges and dashes properly in linear alkanes. Can anyone explain how this works?
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KakaoTalk_20210414_124448246.jpg

I can only view each carbon individually so I don't see why the representations under incorrect is incorrect.
 
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"Each carbon should look like a tetrahedron" - do they?
 
first you have to check what is the hybridisation of the carbon. then check if they the sorrounding atoms are planar or non planar. if they are planar you do not need to draw to wedge dash projection but if they are non planar then you have to.
 
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Wedge dash diagrams are just a way to visualize the 3D geometries of molecules in the 2D plane. The wedges point out of the plane, dashes point into the plane, and lines are in the plane. They don't really need a more elaborate explanation than that.

You don't even need a molecule model, although it can help. Just picture a simple tetrahedral geometry in 3d space. Any confusion about why the incorrect diagrams are incorrect should disappear quickly.
 
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