The following reaction is known as: 
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- Perkin reaction
- Gatterman-Koch Formylation
- Kolbe's reaction
- Gattermann reaction
The Correct Option is D
Solution and Explanation
This is the Gattermann reaction. Gattermann-Koch formylation uses \(\mathrm{CO + HCl}\) with \(\mathrm{AlCl_3/CuCl}\); Perkin gives cinnamic acids and Kolbe's reaction gives salicylic acid with \(\mathrm{CO_2}\).
Answer: (4) Gattermann reaction
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