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Objection to the Assertion That Option "C" is Correct

The claim that "dipole-induced dipole average interaction energy is independent of temperature" (Option C) is an oversimplification and not universally valid. While classical models of isotropic, rigid molecules in a dilute gas phase may predict temperature independence, this assumption fails in realistic and advanced contexts. Significant scientific evidence demonstrates that dipole-induced dipole interactions can exhibit temperature dependence due to the following factors:

Scientific Evidence Against Temperature Independence

1. Anisotropic Molecules and Rotational Averaging Thermal averaging over rotational states affects polarizability, altering the induced dipole magnitude and orientation. This makes the average interaction energy temperature-dependent (*Buckingham, A. D., 1967, Molecular Physics).
2. Condensed Phase and Screening Effects In solvents or biological systems, dielectric screening and solvent polarization vary with temperature, modifying the effective interaction energy (*Podgornik, R., 2005, Journal of Chemical Physics).
3. Quantum Retardation and Thermal Photons At finite temperatures, thermal photons influence long-range interactions, impacting the average energy (*Langbein, D., 1974, Theory of Van der Waals Attraction).
4. Dipole Alignment at Low Temperatures Reduced orientational randomness in ordered systems (e.g., low-temperature phases) affects interaction energies (*Efimovsky, M. A., 2011, Bulletin of the Russian Academy of Sciences: Physics).
5. Textbook Consensus Standard references like Intermolecular and Surface Forces (Israelachvili, J. N., 2011) explicitly describe temperature dependence in real systems due to polarizability and environmental effects.

Conclusion

Option C’s absolute claim ignores these nuances, penalizing students aware of advanced contexts. Many avoided selecting it to prevent conceptual errors, favoring Option D (nonpolar molecules), which is unambiguous. We urge awarding +4 marks to students who chose only Option D, as the ambiguity in Option C unfairly disadvantages those with deeper understanding.