Question
Nitrobenzene on reaction with conc. HNO3/H2SO4 at 80-1000C forms which one of the following products?
-
1,2-dinitrobenzene
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1,3- dinitrobenzene
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1,4-dinitrobenzene
-
1,2,4-trinitrobenzene
Solution
B.
1,3- dinitrobenzene
NO2 group being electron withdrawing reduces electron density at output positions. Hence, now the meta-position becomes electron rich on which the electrophile (nitronium ion) attacks during nitration.
HNO3 +H2SO4 ---> H2NO3+ +HSO-4 +H2O +NO2+