Alkanes having more than 4 CH2 group bending vibration but the one with less than four CH2 group do not show band in IR spectra why??

12 October 2022 1 7K Report

IR spectroscopy

What makes you think so? The signature lines of a methylene groups are 1470, 2850 and 2925cm-1. All these areas are covered here:

https://webbook.nist.gov/cgi/cbook.cgi?ID=C74986&Type=IR-SPEC&Index=1#IR-SPEC

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