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

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The C-H bond in III absorbs at the lowest wave number in the IR spectrum because it is a sp hybridized C-H bond which has the highest s-character (50%) and therefore the highest bond strength. The stronger a bond, the lower the wave number at which it absorbs in the IR spectrum.

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