When/How to distinguish IUPAC and Common

[Nikolina Walas-3J]

I have a question about the naming system. I noticed a couple example where it asked for naming but did not specify IUPAC or common, For example number 6B on Final 2012. And it seems to follow IUPAC but included iso and neo. How do I know when to use these? Also when should we include prim, tert, quat, ect?

[Chem_Mod]

Sec-, tert-, iso and neo are allowed in IUPAC names for substituents. Doing so does not make this into a common name.

Eg. 4-isopropylheptane is an IUPAC name.
but neopentane is a common name because this neo does not refer to a substituent. The IUPAC name is 2,2-dimethylpropane.

[Nikolina Walas-3J]

Okay thank you very much!