Multiple Choice
What is the molecular geometry of methane (CH_4)?
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12. Molecular Shapes & Valence Bond Theory
Molecular Geometry
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Which word or two-word phrase best describes the molecular geometry of the hydrogen cyanide (HCN) molecule?
A
Bent
B
Tetrahedral
C
Linear
D
Trigonal planar
Verified step by step guidance1
Identify the central atom in the HCN molecule. In HCN, 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 has no lone pairs.
Use the VSEPR (Valence Shell Electron Pair Repulsion) theory to predict the molecular geometry. With two regions of electron density and no lone pairs, the electron pairs will arrange themselves to be as far apart as possible.
Recognize that two regions of electron density around the central atom result in a linear geometry, with bond angles close to 180 degrees.
Conclude that the molecular geometry of HCN is best described as 'Linear' because the atoms are arranged in a straight line.
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