Which one of the following is the chemical formula of Hypobromous acid?

Hypobromous acid is a weak, unstable inorganic oxyacid of bromine where the bromine atom exists in the +1 oxidation state [1]. Its chemical formula is represented as HOBr or HBrO [4]. It is primarily produced in aqueous solutions, such as when bromine is dissolved in water, and it partially dissociates into the hypobromite anion (OBr⁻) and a hydrogen cation (H⁺) [3]. In the nomenclature of bromine oxyacids, the formula varies based on the number of oxygen atoms: HBr is hydrobromic acid (no oxygen), HBrO2 is bromous acid, HBrO3 is bromic acid, and HBrO4 is perbromic acid [1]. Therefore, HOBr is the correct formula for hypobromous acid, often written as HOBr to emphasize the bonding structure where hydrogen is bonded to oxygen [4].

Sources

1. [1] https://www.sciencedirect.com/topics/chemistry/hypobromous-acid
2. [2] https://pubchem.ncbi.nlm.nih.gov/compound/Hypobromous-acid
3. [4] https://en.wikipedia.org/wiki/Hypobromous_acid
4. [3] https://webbook.nist.gov/cgi/cbook.cgi?ID=C13517118&Mask=20