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Which of the following absorption peak or peaks would be most useful for identifying the compound diethylamine?
a. Medium stretch from 3500 to 3300 cm-1
b. Two medium peaks, one at 3300 cm-1 and 3400 cm-1
c. Sharp peak at 1750 cm-1
d. Very broad stretch from 3500 to 2500 cm-1

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Answer:

A. Medium stretch from 3500 to 3300 cm-1

Explanation:

What would a wide peak near 3300 cm-1 indicate?

The C-H-stretching modes can be found between 2850 and 3300 cm-1, depending on the hydrization. The range from 2850-3000 cm-1 belongs to saturated systems (alkanes, sp3, example 1), while the peaks from 3000-3100 cm-1 indicate an unsaturated system (alkenes, sp2, example 2; aromatic ring, example 3,4)

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