Question

Write down the products of ozonolysis of 1, 2 - dimethylbenzene (o -xylene). How does the result support Kekules structure for benzene?

Answer 1

The products of ozonolysis of 1, 2 - dimethyl benzene (o -xylene) are shown in the figure.

All three products cannot be obtained by any one of the Kekule's structures. This shows that benzene is a resonance hybrid of the two resonating structures.