15. Analytical Techniques:IR, NMR, Mass Spect

Choose the bond in each pair that you expect to vibrate at the higher wavenumber.

(a) C―N vs. C = N

Which of the following alkene functional groups produces the strongest absorption signal in an $IR$ spectrum?

Which of the following characteristic absorption bands would you expect to find in the infrared (IR) spectrum of caffeine?

Choose the bond in each pair that you expect to vibrate at the higher wavenumber.

(b) C―H vs. C―O

Which major IR absorption is expected for a compound containing a carbonyl group?

Which of the following is a characteristic infrared absorption for triphenylmethanol?

Rank the following compounds from highest wavenumber to lowest wavenumber for their C=O absorption bands:

b.

Which one of the following compounds is most consistent with an IR spectrum that shows a strong, broad absorption around $3300$ cm$-1$ and a sharp absorption near $1700$ cm$-1$?

Which of the following characteristic absorption bands would you expect to observe in the IR spectrum of dibenzalacetone?

Given an IR spectrum with a strong, broad absorption around $3300-3500\mathrm{cm}-1$ and a sharp absorption near $1700\mathrm{cm}-1$, which compound is most likely responsible for this spectrum?

Which of the following characteristic absorption bands would you expect to observe in the IR spectrum of $3$-methyl-$1$-butanol?

Which of the following best explains how infrared (IR) spectroscopy can be used to monitor the progress of a reaction in which an alcohol is converted to a ketone?

Which of the following compounds would show the most intense $C=C$ stretching signal in an IR spectrum?

Which functional group can be identified by a strong, broad absorption around $3300$ cm$-1$ using IR spectroscopy?

Which key difference in the IR spectra allows you to distinguish between cyclohexanol and cyclohexanecarboxylic acid?