Which of the following bonds is IR-inactive?

Name: Which of the following bonds is IR-inactive?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

IR-inactive bonds do not exhibit a change in dipole moment during vibrations, which are symmetrically placed about the central atom. Thus, for I and III, the central atom has a symmetrical molecular geometry and has no net dipole moment. This leads to no vibrations, and therefore no IR absorption, making choices I and III IR-inactive.

Which of the Following Bonds Is IR-Inactive