Question

The proton NMR spectrum in Figure 19-42 is for a compound having an empirical formula $C_4{H}_8{O}_2$. Identify the compound.

Short answer

The organic compound having the empirical formula$C_4{H}_8{O}_2$ is ethyl acetate whose structure is given as

Step-by-step solution

Interpretation of concept

The given proton NMR spectrum is

From the empirical formula of the given compound, there are two oxygen atoms. We can also observe that there are three peaks indicating three different types of protons at 2.0 ppm, 1.1-1.4 ppm and 3.9-4.4 ppm respectively.

Explanation

The peaks at both 2.0 and 1.1-1.4 ppm indicate the presence of$C{H}_3$ group whose singlet and triplet peaks indicate that the$C{H}_3$group is attached to proton-free and methylene groups respectively.

The peak at 3.9-4.4 indicate the presence of $C{H}_2$group with an oxygen atom attached to it.

Thus, the organic compound is ethyl acetate whose structure is