Question
Question: What is the IUPAC name of the following compound ? 
(1) 2−methyl−4−hexanamine
(2) 5−methyl−3−hexanamine
(3) 2−methyl−4−amino hexane
(4) 5−methyl−3−amino hexane
Solution
The systematic approach followed for the nomenclature of organic compounds as recommended by the International Union of Pure and Applied Chemistry is referred to as IUPAC nomenclature of organic compounds. The stem name, prefix, and suffix are the three elements of the IUPAC nomenclature for organic compounds.
Complete answer:
In the given compound the longest chain has six carbon atoms.
NH2 functional group is attached to the third carbon atom. It is added at the suffix as amine. The substituent Methyl group is attached to the fifth carbon atom.
Therefore, the IUPAC name of the compound is 5−methyl−3−amino hexane.
Hence, the correct option is (4) 5−methyl−3−amino hexane.
Functional groups are groups of one or more atoms with different chemical properties regardless of what is attached to them. The atoms of functional groups are bound by covalent bonds with one another and with the rest of the molecule.
So, the correct answer is “Option 4”.
Note:
The amino group is made up of a nitrogen atom connected to hydrogen atoms by single bonds. An organic compound that contains an amino group is known as an amine. Nitrogen, like oxygen, is more electronegative than both carbon and hydrogen, causing the amino group to have a polar property. Chemists do not always follow the IUPAC nomenclature guidelines since some compounds have exceedingly long and tedious names according to the IUPAC nomenclature guidelines.