A. Identify the compound that gives the mass spectrum and infrared spectrum show
ID: 525189 • Letter: A
Question
A. Identify the compound that gives the mass spectrum and infrared spectrum shown below. Draw the compound.
B. A solution of a compound in ethanol shows an absorbance of 0.65 at 236 nm in a cell with a 1-cm light path. Its molar absorptivity in ethanol at that wavelength is 12,600 M1cm1. What is the concentration of the compound?
C. From the list state the approximate wavenumber at which each type of bond is expected to show an IR absorption at 3600-3000 cm-1, 3000-1800 cm-1, 1800-1400 cm-1and 1400-1000 cm-1
Part A
Relative abundance 100 80 55 60- 40 20F 20 40 60 80 100 m/zExplanation / Answer
a) cyclohexane
The molecular ion at m/z=84 corresponds to C6H12. The base peak at m/z=55 is produced by loss of ethene, so it is an odd-electron ion. The IR spectra of cyclohexane includes a strong intensity of 2960-2850 of stretching absorption and a variable intensity of 1470-1350 of scissoring and bending absorption.
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