The determination, by means of isotope dilution analysis, of the molar ratio of
p-methyl (
14C)-biphenyl, 4-methyl (
14C)-2′-nitrobiphenyl, 4-methyl (
14C)-3′-nitrobiphenyl, 4-methyl (
14C)-4′-nitrobiphenyl, 2-chloro-4′-methyl (
14C)-biphenyl, 3-chloro-4′-methyl (
14C)-biphenyl and 4-chloro-4′-methyl (
14C)-biphenyl formed through the reaction of
N-nitroso-
p-methyl (
14C)-acetanilide in an equimolar mixture of nitrobenzene, chlorobenzene and benzene, is described. From the results, the partial rate factors of the ortho, meta and para positions for the homolytic
p-methylphenylation were found to be 10.73, 1.07 and 8.93 for nitrobenzene, and 3.10, 1.04 and 1.16 for chlorobenzene, respectively, the reactivity of the one position of benzene being taken as unity.
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