Advanced Organic Chemistry: Infrared spectrum of chloroethane CH3CH2Cl

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Interpreting & explaining the infrared spectrum of chloroethane CH3CH2Cl

[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 and AP honors chemistry courses: Molecular spectroscopy analysis of chloroethane [spectra page updated Mar 22nd 2026 *]

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 Infrared spectroscopy - spectra index

Introductory note on the infrared spectrum of chloroethane

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

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

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

C2H5Cl CH3CH2Cl infrared spectrum of chloroethane wavenumbers cm-1 functional group detection fingerprint pattern identification of ethyl chloride doc brown's advanced organic chemistry revision notes 

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

chloroethane   CH3CH2Cl   CH3-CH2-Cl

Interpretation of the infrared spectrum of chloroethane

The most prominent infrared absorption lines of chloroethane

C-H stretching vibrations at wavenumbers ~2880 to 3080 cm-1.

C-H bending vibrations at wavenumbers ~1300 to 1500 cm-1.

Characteristic groups of C-Cl vibrations at wavenumbers ~580 to 780 cm-1.

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

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Links associated with chloroethane

The mass spectrum of chloroethane

The H-1 NMR spectrum of chloroethane

The C-13 NMR spectrum of chloroethane

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