In-phase and out-phase stretching modes Acetylene has two C=H groups It will have two C-H stretching

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In-phase and out-phase stretching modes Acetylene has two C=H groups It will have two C-H
stretching frequencies, the in-phase and out-phase stretching modes

The in-phase (symmetric) stretch occurs at 3374/cm and the
out of phase stretch at 3333/cm

Explain why the in phase vibration is located at a higher
frequence than the out of phase stretch in the case of acetylene