a). Themonochlorination of biphenyl occurs at a much greater rate than the chlorination of benzene under the same conditions. Explain this observation and suggest which chlorobiphenyl isomer would be formed preferentially. Draw the dichorobiphenyl isomer that would result from chlorination of this preferred chlorobiphenyl isomer.

b). How could you make 4-t-butylbiphenyl without contamination by 4,4’-di(tbutyl)biphenyl (Hint: use a reaction other than the Friedel-Crafts reaction)