Replacement of hydrogen of benzene by alkyl group in the presence of alkyl halide & aluminum chloride is known as__________________?
Correct answer: C. Friedel & Craft alkylation
- A. Dows process
- B. Friedel & Craft acylation
- C. Friedel & Craft alkylation
- D. Clemmenson reduction
Explanation
Friedel-Crafts alkylation replaces a hydrogen atom of benzene with an alkyl group using an alkyl halide and a Lewis acid such as AlCl3. Friedel-Crafts acylation would introduce an acyl group, not an alkyl group, so option b reflects that common confusion.
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About Benzene and Aromatic Compounds
Benzene has a planar ring of delocalised π electrons, giving aromatic stability and equal carbon-carbon bond lengths. The topic covers resonance, electrophilic substitution reactions such as nitration, halogenation, sulphonation and Friedel-Crafts reactions, along with substituent effects and the distinction between substitution in benzene and addition in ordinary alkenes.
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