Question

The proton spectra in Figure 19-43 a and b for compounds with empirical formula $C_8{H}_{10}$. Identify the compounds.

Short answer

The compound shown in the given proton NMR spectrum is one of dimethylbenzene isomers.

Step-by-step solution

Interpretation of concept

The given proton NMR spectrum is

Explanation

The empirical formula is given by $C_8{H}_{10}$. From the given figure, we can infer that the peaks at 7.0-7.5 ppm and 2.0-2.5 ppm indicate that there is aromatic hydrogen and methyl hydrogen attached to the double bond respectively. We know that the methyl groups attached to the hydrogen are chemically equivalent as only two carbons are left. Thus, the compound can be one of dimethyl benzene isomers given as