Opt C proponoic acid is a short chain saturated fatty acid .methanoi. acid is not fatty acid as carboxylic group doesn't attached to hydrocarbon nd ethanoic acid to not a fatty acid becoz it is not recovered from animal or vegetable cells . By definition fatty acids (R-COOH) where R is a long chain fatty acid..

First Fatty Acid: Methanoic Acid

Introduction:
Fatty acids are organic compounds that consist of a long chain of hydrocarbons with a carboxylic acid group (COOH) at one end. They are important building blocks of lipids and play crucial roles in various biological processes. There are several types of fatty acids, but the first fatty acid is methanoic acid.

Methanoic Acid:
Methanoic acid, also known as formic acid, is the simplest carboxylic acid with the chemical formula HCOOH. It derives its name from ants (Formica in Latin) as it was first isolated from the bodies of red ants. Methanoic acid is a colorless liquid with a pungent odor and is soluble in water.

Structural Formula:
Methanoic acid consists of a single carbon atom bonded to both a hydrogen atom and a carboxyl group (-COOH). Its structural formula can be represented as H-COOH.

Properties:
- Molecular formula: HCOOH
- Molecular weight: 46.03 g/mol
- Melting point: 8.4 °C
- Boiling point: 100.8 °C
- Density: 1.22 g/cm³

Occurrence:
Methanoic acid occurs naturally in certain insects, plants, and animals. It can be found in the venom of some ants and bees, as well as in nettles and stinging caterpillars. In addition, it is produced by certain bacteria and is a metabolic intermediate in various biochemical pathways.

Applications:
Methanoic acid has several applications in different industries:
1. Textile Industry: It is used in dyeing and finishing processes.
2. Agriculture: It is used as a preservative in livestock feed and as a pesticide.
3. Leather Industry: It is used in the tanning of leather.
4. Pharmaceutical Industry: It is used in the production of certain medications.
5. Chemical Industry: It is used as a precursor for the synthesis of other chemicals.

Conclusion:
In conclusion, the first fatty acid is methanoic acid. It is the simplest carboxylic acid and has various applications in industries such as textiles, agriculture, and pharmaceuticals. Methanoic acid occurs naturally in insects, plants, and animals and plays important roles in biological processes.