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Asked by Raj Last Modified
Answer 
Pawar Jyotiba
I hv chemistry teacher qualified CSIR -UGC-NET & GATE with all India rank -6 with 5 years tec exp...
First on reacts with benzene presence of any Lewis acid then u will take any bromination electrophile eg.NBS.Br2 . bromination attached any position in benzene then using nitrating reagent this NO2 electrophile from HNO3 +H2SO4 reagent incoming towords of para position on bromo benzene .
Short trick :- any electron donating group give Ortho ,para directing product eg.bromo benzene or any halo benzene .aniline .toulene .
Or
Any electron withdrawing group meta directing product .eg cyno benzene ,nitro benzene any carbonyl group attached with benzene all give meta product with incoming electrophile.
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