Q. Benzene on treatment with a mixture of conc. $HNO_{3}\ and\ conc.H_{2}SO_{4}$ at 100$℃$ gives
A) Nitrobenzene
B) $m$-dinitrobenzene
C) $p$-dinitrobenzene
D) $o$-dintrobenzene
Explanation
(b)
At $60{^\circ}$ (low temperature) mononitration occurs and nitrobenzene is obtained but at $100℃$, nitrobenzene further undergoes electrophilic substitution and gives $m$-dinitrobenzene (as $–NO_{2}\ is\ a\ meta - directing\ group).$
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Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.