Boiling points of hydrocarbons increase with the increase in number of carbon atoms. It is mainly due to_________________?
Correct answer: B. More strength of London forces
- A. More strength of H-bonding
- B. More strength of London forces
- C. Less polarizability
- D. All of the above
Explanation
As the number of carbon atoms increases, the electron cloud becomes larger and more polarizable, strengthening London dispersion forces between hydrocarbon molecules. Students may choose option a by incorrectly assuming that all substances with higher boiling points form hydrogen bonds.
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About Properties of Liquids
Liquid behavior depends on intermolecular forces, which produce surface tension, viscosity, capillary action and a definite volume without a fixed shape. The topic also covers vapor pressure, evaporation, boiling point and the effect of temperature and external pressure, while distinguishing evaporation at the surface from boiling throughout the liquid.
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