Write the IUPAC name of the structural formulae.
HCOOH

Explanation

The number of carbon atoms : 1
Parent alkane : Methane
Functional group : `-COOH` (.oic cid)
If the carbon chain of the compound contains a -COOH group, then change the ending of the parent name, i.e. 'e' of methane is replaced by '-oic acid'.
Parent suffix : Methanoic acid
IUPAC name : Methanoic acid .