Lesson: Functional Groups in IR Spectra

In this lesson, we will learn how to identify the functional groups in a compound from the nature of the peaks in its infrared spectrum.

Worksheet: 18 Questions

Q1:

A common organic chemical exhibits a strong IR absorption at 1,645 cm⁻¹. Which of the following functional groups could have caused this absorption?

Q2:

A pure, colorless liquid with a high boiling point exhibited a strong IR absorption in the cm⁻¹ range. The only other strong IR signals outside of the fingerprint region can be assigned to resonances. To which of the following chemical families does the liquid most likely belong?

Q3:

An organic compound that is liquid at room temperature exhibits a strong IR absorption at 1,710 cm⁻¹. It is unreactive to acidified potassium dichromate, but the product of its reaction with lithium aluminum hydride exhibits a strong IR absorption in the cm⁻¹ range. To which of the following chemical families does the liquid most likely belong?

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