Rules for IUPAC Nomenclature:-

(1) Recognize the functional group in the compound. That will determine the suffix of the name.

(2) Find the longest continuous chain length that contains the functional group and count the number of carbon atoms in the chain. The number will determine the prefix.

(3) Number the carbon in the longest chain. You need to start numbering so that the functional group is on the carbon with the lowest possible number. Start with the carbon at the end closest to the functional group.

(4) Look for an only branched group:-

→ Name them by counting the number of carbon atom in the branched group.

(5) For the alkyl- halide the halogen atom is treated in much the same way as a branched group.

The halogen atom must be listed before the name of the the main chain in alphabetical order.

IUPAC name → 2-Bromo-2-Methylbutane