For preparing monoalkyl benzene, acylation process is preferred rather than direct alkylation because:
Correct answer: C. In alkylation, polyalkylated products are often formed
- A. In alkylation, a gaseous byproduct is evolved
- B. In alkylation, a large amount of heat is evolved
- C. In alkylation, polyalkylated products are often formed
- D. Alkylation is very costly
Explanation
Friedel-Crafts alkylation is prone to two major side reactions: carbocation rearrangements and polyalkylation. Polyalkylation occurs because the first alkyl group added activates the benzene ring, making it more reactive than the starting material and leading to further alkylation.
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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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