Question

Which of the following compounds will not undergo Friedal-
Craft’s reaction easily : [2013]
(a) Xylene (b) Nitrobenzene
(c) Toluene (d) Cumene

Answer 1

Answer:

(b) Nitrobenzene will not undergo Freidel Crafts reaction easily because due to the prescence of nitro group, it's -Mesomeric effect deactivates the benzene ring for electrophilic substitution.

However, all other compounds given in options are alkyl benzenes and we know that alkyl groups activate the benzene ring by hyperconjugation and very little by +I group for electrophilic substitution.

Hope this helps you !