JEE Main 2021 · ChemistryMultiple choiceSingle correctHardMulti-step

JEE Main 25 February 2021, Shift 2, Chemistry Q44

Question 44 of 90 in this shift, Chemistry question 14 of 30, Section A.

The correct sequence of reagents used in the preparation of 4-bromo-2-nitroethyl benzene from benzene is :

(1) $\mathrm{CH_3COCl/AlCl_3,\ Br_2/AlBr_3,\ HNO_3/H_2SO_4,\ Zn/HCl}$
(2) $\mathrm{CH_3COCl/AlCl_3,\ Zn\text{-}Hg/HCl,\ Br_2/AlBr_3,\ HNO_3/H_2SO_4}$ Official answer
(3) $\mathrm{Br_2/AlBr_3,\ CH_3COCl/AlCl_3,\ HNO_3/H_2SO_4,\ Zn/HCl}$
(4) $\mathrm{HNO_3/H_2SO_4,\ Br_2/AlCl_3,\ CH_3COCl/AlCl_3,\ Zn\text{-}Hg/HCl}$

Official answer

Option 2

NTA final key.

Chapter: Haloalkanes and Haloarenes
Topic: Aromatic Hydrocarbons
Idea tested: Bypassing FC Alkylation Rearrangements

Same topic in other shifts

All Aromatic Hydrocarbons questions

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.