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Question
For a molecule to absorb IR, why must the molecule's vibrations cause fluctuations in the dipole moment of the molecule?
Options:
A .  Because a change in dipole moment lowers the energy required for electronic transitions
B .  Because for absorption to occur, the radiation must interact with the electric field caused by changing dipole moment
C .  Because fluctuations in the dipole moment allow the molecule to deform by bending and stretching
D .  All of the above
Answer: Option B
Answer: (b).Because for absorption to occur, the radiation must interact with the electric field caused by changing dipole moment

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