What is the interpretation of presence of CH3 functional group in the IR ?

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Thomas Mayerhöfer

Depends on the intensity of the band(s). My guess is that you actually see two not very intense peaks at about 2850 and 2920 cm-1, which actually belong to CH2-groups and are quite often present due to a contamination from e.g. machine oil. Am I right?

Nodirali S. Normakhamatov

Am I right? I think so

Abdallah Hussien Fathy

Depends on the intensity of the band(s).

Hassan Nima

this link is useful

www.askthenerd.com/NOW/CH13/13_10.pdf

regards

Khalid Al-Salhie

Interesting question.

Hope you good luck.

Regards

Mostafa Abdel azim Masoud

But. the intensity of the peak increase with temperature increasing