Which of the indicated C-H bonds absorbs at the lowest wave number in the IR spectrum?

Name: Which of the indicated C-H bonds absorbs at the lowest wave number in the IR spectrum?
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Question

Quizplus · Accepted Answer

The C-H bond in Option III absorbs at the lowest wave number because it is a sp3 hybridized C-H bond, which results in a lower bond strength and therefore easier bond stretching. This leads to a lower absorption frequency in the IR spectrum.

Which of the Indicated C-H Bonds Absorbs at the Lowest