Here's why:
* Organic compounds are defined as compounds containing carbon and hydrogen, often with other elements like oxygen, nitrogen, and halogens.
* Carbonic acid is formed from carbon dioxide (CO₂) dissolved in water. While it contains carbon, it doesn't have any hydrogen directly bonded to the carbon atom.
Therefore, carbonic acid lacks the key defining characteristic of an organic compound - a carbon-hydrogen bond.
Instead, carbonic acid is classified as an inorganic acid.