Question

Rank the following compounds in order of decreasing reactivity towards electrophilic substitution reaction.

(I) Chlorobenzene

(II) 4-nitrochlorobenzene

(III) 2, 4-dinitrochlorobenzene

(IV) 2, 4, 6-trinitrochlorobenzene

• A. I > II > III > IV
• B. I > III > II > IV
• C. III > I > IV > II
• D. IV > III > II > I

Answer 1

Answer: (A)

I > II > III > IV

Answer 2

In the presence of +M effect, the rate of mononitration is increase and in the presence of – M effect, the rate of mononitration is decrease.