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MHT CET202525 Apr 2025Morning ShiftChemistryHaloalkanes and HaloarenesActual

Identify ' A ' in the following reaction. (excess) A + (excess) Acetyl chloride [ AlCl ₃] Anhydrous 1 -Chloroacetophenone + 4-chloroacetophenone

Options

  1. ABenzene
  2. BChlorobenzene
  3. CToluene
  4. DPhenol

Correct answer

B. Chlorobenzene

Step-by-step solution

Friedel-Crafts acylation of aromatic compound A with acetyl chloride yields both ortho- and para-chloroacetophenone products, indicating the presence of a chlorine substituent originating from A. The acetyl group directs substitution to positions ortho and para relative to existing substituents. Since both chloroacetophenone isomers are formed, A must contain a chlorine atom attached to the aromatic ring that acts as an ortho-para director. Among the options, only chlorobenzene satisfies these conditions: C ₆ H ₅ C

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