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JEE Main202125 Feb 2021Evening ShiftChemistryHydrocarbonsActual

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

Options

  1. ACH 3 COCl / AlCl 3 , Br 2 / AlBr 3 , HNO 3 / H 2 SO 4 , Zn / HCl
  2. BCH 3 COCl / AlCl 3 , Zn - Hg / HCl , Br 2 / AlBr 3 , HNO 3 / H 2 SO 4
  3. CHNO 3 / H 2 SO 4 , Br 2 / AlCl 3 , CH 3 COCl / AlCl 3 , Zn - Hg / HCl
  4. DBr 2 / AlBr 3 , CH 3 COCl / AlCl 3 , HNO 3 / H 2 SO 4 , Zn / HCl

Correct answer

B. CH 3 COCl / AlCl 3 , Zn - Hg / HCl , Br 2 / AlBr 3 , HNO 3 / H 2 SO 4

Step-by-step solution

Benzene is an aromatic compound which shows the characteristic reaction of electrophilic aromatic substitution reactions. This is because the reaction is initiated by an electrophile. Benzene reacts with CH 3 ​Cl in presence of anhydrous AlCl 3 ​ to give Toulene. This is fridel crafts Alkylation and an electrophillic substitution.

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