Multiple Choice
Which of the following molecules would be expected to exhibit a trigonal planar geometry?
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12. Molecular Shapes & Valence Bond Theory
Molecular Geometry
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Which of the following best describes the molecular geometry of CH2O (formaldehyde)?
A
Trigonal planar
B
Linear
C
Tetrahedral
D
Bent
Verified step by step guidance1
Identify the central atom in the molecule CH2O, which is carbon (C).
Determine the number of regions of electron density (bonding and lone pairs) around the central atom. Carbon in CH2O forms two single bonds with hydrogen atoms and one double bond with oxygen, totaling three regions of electron density.
Recall that three regions of electron density around a central atom correspond to a trigonal planar electron geometry according to VSEPR theory.
Since there are no lone pairs on the central carbon atom, the molecular geometry matches the electron geometry, which is trigonal planar.
Conclude that the molecular geometry of CH2O is trigonal planar, not linear, tetrahedral, or bent.
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