The correct IUPAC name of Freon 12 is

1,1-Dichloro-1,1-difluoromethane

The correct answer is Option (2) → 1,1-Dichloro-1,1-difluoromethane

Freon-12 is a chlorofluorocarbon (CFC) with the molecular formula:

$CCl_{2}F_{2}$

This compound is derived from methane, where four hydrogen atoms are replaced by halogens:

$CH_{4} \rightarrow CCl_{2}F_{2}$

Thus the carbon atom is attached to:

• Two chlorine atoms
• Two fluorine atoms

Since all substituents are attached to the same carbon atom, their position is written as 1,1.

According to IUPAC nomenclature rules:

• Substituents are listed in alphabetical order
• "Chloro" comes before "fluoro"

Thus the correct IUPAC name is:

1,1-Dichloro-1,1-difluoromethane