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    In-phase and out-phase stretching modes

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    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.

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    https://brainmass.com/chemistry/organic-chemistry/in-phase-out-phase-stretching-modes-326522

    Solution Summary

    The expert examines in-phase and out-phase stretching modes.

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