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COMEDK2025ChemistryHydrocarbonsActual

Consider the following reaction C ₆ H ₆+ CH ₃ CH ₂ Br [ ] anhyd. AlCl ₃ X The major product ' X ' is:

Options

  1. AToluene
  2. BChlorobenzene
  3. CBromobenzene
  4. DEthylbenzene

Correct answer

D. Ethylbenzene

Step-by-step solution

The reaction given is a Friedel-Crafts alkylation reaction. Benzene ( C ₆ H ₆ ) reacts with ethyl bromide ( CH ₃ CH ₂ Br ) in the presence of an anhydrous Lewis acid catalyst, AlCl ₃ . The mechanism involves the formation of an electrophile, the ethyl carbocation ( CH ₃ CH ₂⁺ ), which then undergoes electrophilic aromatic substitution on the benzene ring. The reaction is: C ₆ H ₆ + CH ₃ CH ₂ Br anhyd. AlCl ₃ C ₆ H ₅ CH ₂ CH ₃ + HBr . The product C ₆ H ₅ CH ₂ CH ₃ is ethylbenzene. Answer: Ethylbenzene

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