An organic compound A having molecular formula C₆H₆O gives a violet colour with neutral FeCl₃ ​ solution. A on treatment with CO₂​ and NaOH at 400 K under pressure gives B which on acidification gives a compound C. The compound C reacts with acetyl chloride to give D which is popular pain killer. Deduce the structure of A, B, C and D.

What is the name of conversion of compound A to compound C?

Kolbe's reaction

The correct answer is option 2.Kolbe's reaction.

The conversion of compound A (phenol) to compound C (salicylic acid) involves the reaction of phenol with COâ‚‚ and NaOH under pressure and elevated temperature, followed by acidification. This reaction is known as Kolbe's reaction.