The main product formed when benzene is alkylated with n-propyl chloride in presence of anhydrous AlCl3 is:
Correct answer: B. Iso-Propyl benzene
- A. Ethyl & methyl benzene
- B. Iso-Propyl benzene
- C. n-Propylbenzene
- D. Chlorobenzene
Explanation
In the Friedel-Crafts alkylation, the reaction proceeds via a carbocation intermediate. The initially formed primary n-propyl carbocation rapidly rearranges via a hydride shift to the more stable secondary isopropyl carbocation, which then attacks the benzene ring.
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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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