The correct answer is option IV.
A compound is formed whenever two or more atoms form chemical bonds with each other in a specific ratio. The chemical formula for water is H2O. This means that each water molecule consists of one oxygen atom chemically bonded to its two hydrogen atoms. Therefore, water is a compound.
The IUPAC name for the specific compound is formic anhydride. It is formic acid or anhydride of formic acid. A compound is a pure substance made up of two or more elements that have the same mass and properties that are quite different from their constituents. They are made up of different types of atoms chemically bonded together. A compound is a substance in which two or more different chemical elements are combined in a certain ratio.
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