Multiple Choice
What is the molecular geometry of NH_3?
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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 HCN?
A
Bent
B
Tetrahedral
C
Trigonal planar
D
Linear
Verified step by step guidance1
Identify the central atom in the molecule HCN. In this case, carbon (C) is the central atom bonded to hydrogen (H) and nitrogen (N).
Determine the number of regions of electron density (bonding and lone pairs) around the central atom. Carbon in HCN forms two sigma bonds: one with hydrogen and one with nitrogen, and there are no lone pairs on carbon.
Use the VSEPR (Valence Shell Electron Pair Repulsion) theory to predict the molecular geometry. Two regions of electron density around the central atom will arrange themselves to be as far apart as possible, which corresponds to a linear shape.
Confirm that the molecule has no lone pairs on the central atom that would distort the shape, so the bond angle is approximately 180 degrees, consistent with a linear geometry.
Conclude that the molecular geometry of HCN is linear, not bent, tetrahedral, or trigonal planar.
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