15. Analytical Techniques:IR, NMR, Mass Spect

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?

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

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

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$-1$?