For a molecule to absorb IR, why must the molecule's vibrations cause fluctuations in the dipole moment of the molecule?

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For a molecule to absorb IR, why must the molecule's vibrations cause fluctuations in the dipole moment of the molecule? Answer: Because for absorption to occur, the radiation must interact with the electric field caused by changing dipole moment

Question context

This question is part of 🧬 Biochemistry within the broader 🧬 Medical Science subject and appears in the DemoPaper-Pakistan preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.