The IUPAC name of the given compound is
Both A & B
The parent chain is four carbons long. According to the IUPAC rules of nomenclature, while numbering the carbon atoms, the carbon with the double bond should be at the lowest position. Therefore, the IUPAC name of the given structure is 1- butene or but- 1- ene. This is an organic chemical compound having the chemical formula
CH3CH2CH=CH2.