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Infrared Spectroscopy and Mass...
Exam

1 .       Which type of radiation has the highest photon energy? [Hint]



2 .       Which type of radiation is used in the medical diagnostics technique MRI (magnetic resonance imaging)? [Hint]



3 .       What is the speed of light in vacuum? [Hint]



4 .       How long is a "micron" (aka micrometer) in meters? [Hint]



5 .       What is the definition of "wavenumber"? [Hint]



6 .       Which area of the IR spectrum is called the "fingerprint region"? [Hint]



7 .       How is the dipole moment of a dipolar diatomic molecule affected when the bond lengthens during a molecular vibration? [Hint]



8 .       Which one of the following molecules has the weakest IR absorption for the stretching vibration (if any)? [Hint]



9 .       In which region would you look for C=C stretching modes? [Hint]



10 .       Which one of the following compounds shows the lowest carbonyl frequency? [Hint]



11 .       What is the natural abundance of carbon-13? [Hint]



12 .       The mass spectrum of 1-bromopropane contains a base peak at m/z = 43. What ion is causing that peak? [Hint]



13 .       Which one of the following ketones can undergo a McLafferty rearrangement? [Hint]



14 .       What do the vertical and horizontal axes measure in a mass spectrum? [Hint]



15 .       What is the mass of the "molecular ion" M+ generated from ethane? [Hint]



16 .       Which formula can be used to determine the number of carbon atoms in a molecule based on the intensities of the M+ and (M+1)+ peaks? [Hint]



17 .       Which two peaks will tell you whether an alkyl halide contains bromine? [Hint]



18 .       Which of the halogens comes in two isotopes with about the same abundances? [Hint]



19 .       The spectrum of pentane shows a peak at m/z = 29. What species causes this peak? [Hint]



20 .       What is the mass of the stable and frequently observed fragment allyl cation? [Hint]



21 .       The mass spectrum of 2-chloropropane contains a base peak at m/z = 43. What ion is causing that peak? [Hint]



22 .       From which electron pair does the electron come that is being ejected during ionization of 2-butanol? [Hint]



23 .       Which alkene is formed in the McLafferty rearrangement of 2-heptanone? [Hint]



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