Question

Pick the reaction that shows the Gattermann-Koch process:

• A. Benzene + methyl chloride → ethylbenzene (AlCl\(_3\) catalyst)
• B. Benzene + CO + HCl → benzaldehyde (AlCl\(_3\), CuCl catalysts)
• C. Benzene + bromine → bromobenzene (FeBr\(_3\) catalyst)
• D. Benzene + acetyl chloride → acetophenone (AlCl\(_3\) catalyst)

Hint:

The Gattermann-Koch process is a method for synthesizing benzaldehyde from benzene using CO and HCl in the presence of AlCl\(_3\) and CuCl catalysts.

Answer 1

The Correct Option is B

The Gattermann-Koch reaction is the standard route for putting an aldehyde group directly onto a benzene ring using carbon monoxide and hydrogen chloride gas, catalysed by AlCl\(_3\) and CuCl, giving benzaldehyde as the product. The other reactions listed produce an alkylbenzene, a bromobenzene, and a ketone respectively, none of which is the Gattermann-Koch outcome. So the matching reaction is option (B).