For halogenation of benzene, which reagent is used:
Correct answer: B. AlCl3
- A. H2SO4
- B. AlCl3
- C. HNO3
- D. HCI
Explanation
Any halogen in its standard state is not a strong electrophile to attack the electron cloud on the benzene ring and react with it. AlCl3 ats as a Lewis acid catalyst to make the halogen into a strong electrophile. For example:Cl2 + AlCl3 ---> Cl+ {electrophile} + AlCl4-
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About Chemistry of Hydrocarbons
Hydrocarbons are studied through the structures and reactions of alkanes, alkenes, alkynes and aromatic compounds. Coverage includes free radical substitution in alkanes, electrophilic addition to carbon-carbon multiple bonds, benzene substitution, aromatic stability and the difference between addition reactions of alkenes and substitution reactions of benzene.
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