question_answer 84)

  (A) Toluene on Friedel-Crafts methylation gives o- and p-xylene. (R) \[C{{H}_{3}}\] ?group bonded to benzene ring increases electron density at o- and p-positions.

Answer:

  (a) In toluene, methyl group is activating and ortho-para directing because it increases electron density at ortho and para positions.