Multiple Choice
What is the molecular geometry around each carbon atom in the molecule C_2H_4 (ethene)?
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12. Molecular Shapes & Valence Bond Theory
Molecular Geometry
Multiple Choice
Consider the molecule below, where atoms A, B, and C are labeled. Which of the following correctly describes the molecular geometry at each labeled atom?A: linearB: trigonal planarC: tetrahedral
A
A: tetrahedral; B: bent; C: linear
B
A: linear; B: trigonal planar; C: tetrahedral
C
A: trigonal planar; B: linear; C: tetrahedral
D
A: bent; B: tetrahedral; C: trigonal planar
Verified step by step guidance1
Identify the central atom for each labeled position (A, B, and C) and count the number of atoms bonded to it as well as any lone pairs of electrons on that atom. This will help determine the electron domain geometry.
Recall the VSEPR (Valence Shell Electron Pair Repulsion) theory, which states that electron pairs around a central atom arrange themselves to minimize repulsion, leading to specific molecular geometries such as linear, trigonal planar, tetrahedral, bent, etc.
For atom A, if it has two regions of electron density (bonded atoms or lone pairs), the geometry is linear. For atom B, if it has three regions of electron density with no lone pairs, the geometry is trigonal planar. For atom C, if it has four regions of electron density, the geometry is tetrahedral.
Match each atom's electron domain count and lone pair presence to the corresponding molecular geometry: linear (2 regions), trigonal planar (3 regions), tetrahedral (4 regions).
Compare your determined geometries for atoms A, B, and C with the given options to select the correct description of the molecular geometry at each labeled atom.
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