How can you distinguish between terminal and internal alkynes using IR spectrum?

Infrared (IR) spectroscopy can be used to distinguish between terminal and internal alkynes based on the presence or absence of a characteristic absorption band in the IR spectrum.

1. Terminal Alkynes: Terminal alkynes have a hydrogen atom directly bonded to the carbon atom at the end ___ __________ ___ ____ ___ _____ ______ __________.
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