Match each compound to the correct IR spectrum, and give a brief reason for your selection.
For the following reaction, which of the following is consistent with the IR spectrum of the product?
A) Absorption at 2250 cm –1 should disappear and absorption around 3400 cm –1 should appear.
B) Absorption at 2250 cm –1 should disappear.
C) None of these.
D) Absorption at 3200-3400 cm –1 and 1720cm –1 should appear
E) Absorption at 2250 cm –1 should disappear, new absorption at 2600-2800 cm –1 and 1720 cm –1 should appear.
Write structures for all compounds with molecular formula C 4H6O that would not be expected to exhibit infrared absorption in the 3200–3550-cm -1 and 1620–1780-cm -1 regions.
There are four amides with the formula C3H7NO. (a) Write their structures. ( b) One of these amides has a melting and a boiling point that are substantially lower than those of the other three. Which amide is this? Explain your answer. (c) Explain how these amides could be differentiated on the basis of their IR spectra.
Write structural formulas for four compounds with the formula C 3H6O and classify each according to its functional group. Predict IR absorption frequencies for the functional groups you have drawn.