(i) o-xylene gives a mixture of dimethyl glyoxal, glyoxal and methyl glyoxal as ozonolysis product.
(ii) m- and p-xylene give a mixture of 2 moles of methyl glyoxal and 1 mole of glyoxal as ozonolysis product.
(iii) Ethyl benzene gives ethyl glyoxal and glyoxal as ozonolysis product.