The names have been correctly sorted as follows;
Molecule 1 - 3-chloro-4-iodo-2-methyl hexane
Molecule 2 - 4-chloro-3-iodo-2-methyl hexane
Molecule 4 - 3-chloro-2-iodo-4-methyl hexane
The IUPAC naming system for organic compounds
To name organic compounds, identify the longest continuous chain of carbon atoms, the "parent chain". Look up the root name of this chain based on its length, and identify each substituent and its position on the chain with a number.
Combine the root name, substituent prefixes with their positions, and functional group suffixes to form the complete name. Lastly, use commas and hyphens to separate and connect different parts of the name.