$\mathrm{Benzene} \underset{\mathrm{Conc}.{\mathrm{HNO}}_3,<60°\mathrm{C}}{\overset{\mathrm{Conc}.{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }}\mathrm{A}\underset{\mathrm{dark}}{\overset{{\mathrm{CI}}_2, {\mathrm{FeCI}}_3}{\to }}\mathrm{B}.$Incorrect statement is

A is less reactive than benzene towards electrophilic substitution

B is p-chloronitrobenzene

Electrophile in the formation of ‘A’ is nitronium ion

A → B is electrophilic substitution