Chemistry - Carboxylic acid and their Derivatives Question with Solution | TestHub

J is phthalic acid and K is phthalic anhydride.

Conversion $\mathrm{K}\to \mathrm{L}$ involves formation of an anhydride.

Step $\mathrm{L}\to \mathrm{M}$ is an example of Hofmann bromamide rearrangement leading to an anchralic acid.

The final step $\mathrm{N}\to \mathrm{O}$ involves esterification followed by intramolecular cyclisation giving a heterocyclic compound containing nitrogen.