C2H5Br CH3CH2Br infrared spectrum of bromoethane prominent wavenumbers cm-1 detecting ? functional groups present finger print for identification of bromoethane ethyl bromide image diagram doc brown's advanced organic chemistry revision notes

Advanced Organic Chemistry: Infrared spectrum of bromoethane CH₃CH₂Br

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Interpreting the infrared spectrum of bromoethane

[Author © Dr Phil Brown PhD: Doc Brown's advanced level organic chemistry exam revision notes suitable for students of UK A level chemistry courses & US K12 grade 11, grade 12 & AP honors chemistry courses: Molecular spectroscopy of bromoethane [spectra updated Mar 19th 2026 *]

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Infrared spectroscopy - spectra index

Introductory note on the infrared spectrum of bromoethane

Students and teachers please note my explanation of the infrared spectrum of bromoethane is designed for advanced, but pre-university, chemistry courses.

Based in the infrared spectrum diagram for bromoethane, only some of the most prominent peaks for particular bond vibrations are discussed, particularly if bromoethane has a functional group with a particular characteristic wavenumber peak.

The infrared spectrum of bromoethane is unique and the whole, or selected wavenumbers, can be used to fingerprint its identity, sometimes analysing a mixture containing bromoethane or following its change of concentration in a reaction.

C2H5Br CH3CH2Br infrared spectrum of bromoethane wavenumbers cm-1 functional group detection fingerprint pattern identification of bromoethane ethyl bromide doc brown's advanced organic chemistry revision notes

Spectra obtained from a liquid film of bromoethane. The right-hand part of the of the infrared spectrum of bromoethane, wavenumbers ~1500 to 400 cm^-1 is considered the fingerprint region for the identification of bromoethane and most organic compounds. It is due to a unique set of complex overlapping vibrations of the atoms of the molecule of bromoethane.

Bromoethane

The molecular structure and naming of haloalkanes

Interpretation of the infrared spectrum of bromoethane

The most prominent infrared absorption lines of bromoethane

Several moderately strong absorption bands at wavenumbers 2975 to 2845 cm-1 for C-H stretching vibrations - collectively give the impression of strong absorption in the infrared spectrum of bromoethane.

Several strong absorption bands from C-H deformation vibrations at wavenumbers 1470 to 1370 cm^-1.

Several strong absorption bands from 780 to 580 cm^-1 due to C-Br stretching vibrations of bromoethane.

The absence of other specific functional group bands will show that a particular functional group is absent from the bromoethane molecular structure.

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