Multiple Choice
Given the following molecules: CHCl3, CH4, and CH3F, which option correctly ranks them from strongest to weakest dipole-dipole forces?
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13. Liquids, Solids & Intermolecular Forces
Intermolecular Forces
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Which of the following compounds exhibits only London dispersion intermolecular forces?
A
CCl4
B
CH3Cl
C
H2O
D
NH3
Verified step by step guidance1
Identify the types of intermolecular forces present in each compound by analyzing their molecular structure and polarity.
Recall that London dispersion forces are present in all molecules but are the only intermolecular forces in nonpolar molecules.
Examine each compound: CH3Cl is polar due to the C-Cl bond and has dipole-dipole forces; H2O is polar and exhibits hydrogen bonding; NH3 is polar and also exhibits hydrogen bonding.
CCl4 is a symmetrical molecule with four identical C-Cl bonds arranged tetrahedrally, making it nonpolar overall, so it only exhibits London dispersion forces.
Conclude that the compound exhibiting only London dispersion forces is CCl4 because it is nonpolar and lacks hydrogen bonding or dipole-dipole interactions.
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