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.© BrainMass Inc. brainmass.com October 10, 2019, 1:14 am ad1c9bdddf
The expert examines in-phase and out-phase stretching modes.