Solution:Concept- Formic acid is the simplest carboxylic acid with the molecular formula . It is a naturally occurring acid which is found in ants. The Latin name for ants is "Formica", from which the name formic acid is derived.
Formic acid is a weak acid that is colourless liquid with a pungent smell. Formic acid is dangerous to the human body in high concentrations, but very useful in low concentrations. It has antibacterial nature which makes it useful as a preservative.. It is also used in pesticides and cosmetic ingredients.
The IUPAC name of the formic acid is Methanoic acid as it has one Carbon atom and a -carboxylic functional group. Ethanoic acid is acetic acid.
Hence, the correct answer is 1.