The IR spectrum of an unknown compound is shown in FIGURE 10.17. What functional groups does the compound contain?

Question

Strategy

All IR spectra have many absorptions, but those useful for identifying specific functional groups are usually found in the region from 1500 [latex]cm^{-1}[/latex] to 3300 [latex]cm^{-1}[/latex] Pay particular attention to the carbonyl region (1670 to 1780 [latex]cm^{-1}[/latex])the aromatic region (1660 to 2000 [latex]cm^{-1}[/latex]), the triple bond region (2000 to 2500[latex]cm^{-1}[/latex])and the C–H region (2500 to 3500 [latex]cm^{-1}[/latex])

Accepted Answer

The spectrum shows an intense absorption at 1725 [latex]cm^{-1}[/latex] due to a carbonyl group (perhaps an aldehyde, –CHO), a series of weak absorptions from 1800 to 2000 [latex]cm^{-1}[/latex]characteristic of aromatic compounds, and a C–H absorption near 3030 [latex]cm^{-1}[/latex] also characteristic of aromatic compounds. In fact, the compound is phenylacetaldehyde.

Question 10.6: The IR spectrum of an unknown compound is shown in FIGURE 10...

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