Which is true about London forces?
Correct answer: D. All of the above.
- A. London forces are present in non-polar molecules.
- B. London forces are present in polar molecules.
- C. London forces are created between an instantaneous dipole and an induced dipole.
- D. All of the above.
Explanation
London dispersion forces are a type of van der Waals force and are the weakest intermolecular force. They are present in all molecules, regardless of polarity. These forces are more significant in non-polar molecules because they are the only type of intermolecular force present. In polar molecules, dipole-dipole interactions are stronger, but London forces still exist. London forces occur due to the temporary and instantaneous dipoles that arise from electron movement, which can induce a dipole in a neighboring particle, leading to an attraction. Therefore, the correct answer is 'All of the above' because each statement highlights a true aspect of London forces.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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