The following reaction of benzene with carbon monoxide and hydrogen chloride in the presence of aluminum trichloride to give benzaldehyde is known as
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Gatterman-Koch reaction
The reaction shown is:
Benzene + CO + HCl in the presence of anhydrous AlCl₃ and CuCl → Benzaldehyde (–CHO group introduced).
This reaction is called the Gattermann–Koch reaction.
Benzene reacts with carbon monoxide and hydrogen chloride in the presence of AlCl₃ and CuCl to introduce a formyl group (–CHO) forming benzaldehyde.
OTHER OPTIONS
-
Kolbe reaction – used for carboxylation of phenoxide ions to form salicylic acid.
-
Williamson ether synthesis – used for preparing ethers from alkoxides and alkyl halides.
-
Friedel–Crafts reaction – introduces alkyl or acyl groups, not specifically the –CHO group using CO and HCl.