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a. An oxygen-containing compound shows an absorption band

Chapter 14, Problem 29P

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QUESTION:

Problem 29P

a. An oxygen-containing compound shows an absorption band at ~1700 cm−1 and no ab­sorption bands at ~3300 cm−1, ~2700 cm−1, or ~1100 cm−1. What class of compound is it?

b. A nitrogen-containing compound shows no absorption band at ~3400 cm−1 and no absorption bands between 1700 cm−1 and 1600 cmWhat class of compound is it?

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QUESTION:

Problem 29P

a. An oxygen-containing compound shows an absorption band at ~1700 cm−1 and no ab­sorption bands at ~3300 cm−1, ~2700 cm−1, or ~1100 cm−1. What class of compound is it?

b. A nitrogen-containing compound shows no absorption band at ~3400 cm−1 and no absorption bands between 1700 cm−1 and 1600 cmWhat class of compound is it?

ANSWER:

Solution  29P

(a)

The functional groups aldehyde, ketones, acids, esters, amides, acid halides, and anhydrides contain carbonyl group.

The base values for C=O stretching vibrations for carbonyl groups is as follows:

Thus, the absorption band at  indicates carbonyl group.

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