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Solution


Q.

Number of compounds from the following which cannot undergo Friedel-Crafts reaction is ______.
toluene, nitrobenzene, xylene, cumene, aniline, chlorobenzene, m-nitroaniline, m-dinitrobenzene.                [2024]

Ans.

(4)

     C6H5-G→no Friedel Craft acylation or alkylation.

     G=(i) all -M groups such as -CHO,-NO2,-COCl,-CN etc

     (ii) Very strong +M groups such as -CH2-,-NH-,-O-,-OH,-NH2,-NHR, and -NR2

      (iii) Very strong -I groups such as -CX3,-NH3+ and  NH3+

       Thus, nitrobenzene, aniline, m-nitroaniline and m-dinitrobenzene cannot undergo Friedel Crafts reaction.