be regarded as a resonance hybrid of the following two Kekule structures (A)
and (B). Ozonolysis of each one of these gives two products. For example,
Thus, in all three products are
obtained by the ozonolysis of o-xylene (i.e., glyoxal, methyl glyoxal and
dimethyl glyoxal). Since, all the three products cannot be obtained from any
one of the two Kekule structures, (A) and (B), this shows that o-xylene is a resonance
hybrid of the two Kekule structures, (A) and (B).
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