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Advanced Organic Chemistry: Infrared spectrum of bromoethane

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Interpreting the infrared spectrum of bromoethane

Doc Brown's Chemistry Advanced Level Pre-University Chemistry Revision Study Notes for UK IB KS5 A/AS GCE advanced A level organic chemistry students US K12 grade 11 grade 12 organic chemistry courses involving molecular spectroscopy analysing infrared spectra of bromoethane

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Infrared spectroscopy - spectra index

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.

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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-Cl 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.


Key words & phrases: C2H5Br CH3CH2Br image and diagram explaining the infrared spectrum of bromoethane, complete infrared absorption spectrum of bromoethane, comparative spectra of bromoethane, prominent peaks/troughs for identifying functional groups in the infrared spectrum of bromoethane, important wavenumber values in cm-1 for peaks/troughs in the infrared spectrum of bromoethane, revision of infrared spectroscopy of bromoethane, fingerprint region analysis of bromoethane, how to identify bromoethane from its infrared spectrum, identifying organic compounds like bromoethane from their infrared spectrum, how to analyse the absorption bands in the infrared spectrum of bromoethane detection of a functional groups in the bromoethane molecule example of the infrared spectrum of a molecule like bromoethane with a functional group  interpreting interpretation of the infrared spectrum of bromoethane shows presence of a functional group formula ethyl bromide


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