Correct Answer: C
Explanation:
Kolbe-Schmitt reaction (Kolbe process): A reaction for adding a carboxyl group onto the benzene ring of a phenol. Used for the industrial synthesis of salicylic acid to be converted into aspirin.
The formation of side products depends on the ease of the follow-up oxidation which leads to carbenium ions, and their subsequent rearrangement. Due to a large number of side products Kolbe’s reaction