Question

what is kolbe,s reaction?

Answer 1

The Kolbe–Schmitt reaction or Kolbe process (named after Hermann Kolbe and Rudolf Schmitt) is a carboxylation chemical reaction that proceeds by heating sodium phenoxide (the sodium salt of phenol) with carbon dioxide under pressure (100 atm, 125 °C), then treating the product with sulfuric acid.

Answer 2

Hey !!

When phenol is treated with sodium hydroxide, sodium phenoxide is formed. Phenoxide ion is even more reactive than phenol towards electrophilic substitution. Hence, it undergoes electrophilic substitution with carbon dioxide, a weak electrophile.

 o-Hydroxy benzoic acid is formed as the main product. This is called Kolbe's Reaction.