Question:
When chlorobenzene is treated with acetyl chloride in the presence of anhydrous AlCl\(_3\), 4-Chloroacetophenone is formed as the major product. It is an example of
When chlorobenzene is treated with acetyl chloride in the presence of anhydrous AlCl\(_3\), 4-Chloroacetophenone is formed as the major product. It is an example of
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Friedel-Crafts acylation introduces a ketone group onto an aromatic ring and is an electrophilic substitution reaction.
Updated On: Apr 24, 2026
- Nucleophilic substitution
- Electrophilic substitution
- Free radical substitution
- Nucleophilic addition
- Electrophilic addition
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
The reaction of an aromatic compound with an acyl chloride (R-COCl) in the presence of a Lewis acid (AlCl\(_3\)) is a classic named reaction.
Step 2: Detailed Explanation:
This reaction is the Friedel-Crafts acylation reaction. The acyl chloride (acetyl chloride, CH\(_3\)COCl) reacts with AlCl\(_3\) to form an acylium ion (CH\(_3\)-C≡O\(^+\)), which is a strong electrophile. This electrophile attacks the electron-rich benzene ring (chlorobenzene), leading to substitution of a hydrogen atom. Therefore, the reaction mechanism is electrophilic aromatic substitution.
Step 3: Final Answer:
This is an example of electrophilic substitution.
The reaction of an aromatic compound with an acyl chloride (R-COCl) in the presence of a Lewis acid (AlCl\(_3\)) is a classic named reaction.
Step 2: Detailed Explanation:
This reaction is the Friedel-Crafts acylation reaction. The acyl chloride (acetyl chloride, CH\(_3\)COCl) reacts with AlCl\(_3\) to form an acylium ion (CH\(_3\)-C≡O\(^+\)), which is a strong electrophile. This electrophile attacks the electron-rich benzene ring (chlorobenzene), leading to substitution of a hydrogen atom. Therefore, the reaction mechanism is electrophilic aromatic substitution.
Step 3: Final Answer:
This is an example of electrophilic substitution.
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