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NEET 2004
Exam
NEET
Year
2004
Subject
Chemistry
Chapter
Hydrocarbons

NEET 2004 · Chemistry · Hydrocarbons

Using anhydrous AlCl_3 as catalyst, which one of the following...

Using anhydrous AlCl3\mathrm{AlCl}_3 as catalyst, which one of the following reactions produces ethylbenzene (PhEt)(\mathrm{PhEt}) ?Using anhydrous AlCl_3 as catalyst, which one of the following reactions produces ethylbenzene (PhEt) ?

Options

  1. AH3C−CH2OH+C6H6\mathrm{H}_3 \mathrm{C}-\mathrm{CH}_2 \mathrm{OH}+\mathrm{C}_6 \mathrm{H}_6
  2. BCH3−\mathrm{CH}_3-\mathrm{CH}=\mathrm{CH}2+C6H6_2+\mathrm{C}_6 \mathrm{H}_6
  3. CH2\mathrm{H}_2\mathrm{C}=\mathrm{CH}2+C6H6_2+\mathrm{C}_6 \mathrm{H}_6
  4. DH3C−CH3+C6H6\mathrm{H}_3 \mathrm{C}-\mathrm{CH}_3+\mathrm{C}_6 \mathrm{H}_6

Correct answer

C. H2\mathrm{H}_2\mathrm{C}=\mathrm{CH}2+C6H6_2+\mathrm{C}_6 \mathrm{H}_6

Step-by-step solution

In Friedel craft reaction benzene with ethylene in presence of HCl\mathrm{HCl} and anhydrous AlCl3\mathrm{AlCl}_3 reacts to form ethyl benzene. Using anhydrous AlCl_3 as catalyst, which one of the following reactions produces ethylbenzene (PhEt) ?
Related Theory Anhydrous AlCl3\mathrm{AlCl}_3 is used as a catalyst because it acts as a Lewis acid which can accept electron by forming intermediates and also by speeding up the reaction. It also leads in the creation of carbocation which is used in the electrophilic substitution reaction.
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