Discussion
Assertion (A): Assertion: Carbon dioxide's symmetric stretch does not appear in an infrared spectrum.
Reason (R): Reason: The dipole moment does not change during that vibration.
Select the correct answer from the options below.
Answer: A
Both are true and the second is the reason: the two bond dipoles cancel throughout the symmetric motion, so there is nothing for the oscillating field to couple to. The asymmetric stretch and the bend both do change the dipole and both appear strongly. That a molecule can vibrate vigorously and absorb nothing is the selection rule's whole content, and carbon dioxide is the standard illustration of it.
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