Advanced Organic Chemistry: Mass spectrum of chloroethane
The mass spectrum of chloroethane
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 mass spectra of chloroethane
chloroethane CH3CH2Cl CH3-CH2-Cl
Interpreting the fragmentation pattern of the mass spectrum of chloroethane
[M]+ is the molecular ion peak (M) with an m/z of 64 or 66 and corresponding to [C2H5Cl]+, the original chloroethane molecule minus an electron, [CH3CH235Cl]+ and [CH3CH237Cl]+.
The small M+1 peak at m/z 65 (and minute at m/z 67), corresponds to an ionised chloroethane molecule with one 13C atom in it i.e. an ionised chloroethane molecule of formula [13C12C2H5Cl]+
The most abundant ion of the molecule under mass spectrometry investigation (chloroethane) is usually given an arbitrary abundance value of 100, called the base ion peak, and all other abundances ('intensities') are measured against it.
Identifying the species giving the most prominent peaks (apart from M) in the fragmentation pattern of chloroethane.
Unless otherwise indicated, assume the carbon atoms in chloroethane are the 12C isotope.
Interpreting the mass spectrum of 1-chlorobutane
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