The substance in the image is a purple screen. The IUPAC name of the substance is simply "screen".
The substance in the image is a purple screen. It is not necessary to put cis or trans in italics to identify the substance.
The IUPAC name of a substance is a systematic way of naming chemical compounds. It is based on the structure of the compound and the rules of the International Union of Pure and Applied Chemistry (IUPAC).
To name a substance using the IUPAC system, you first need to identify the longest carbon chain in the molecule. This is called the parent chain. The names of the substituents on the parent chain are then added to the name of the parent chain.
The substituents are named in alphabetical order, except for the prefixes cis and trans. The cis and trans prefixes are used to indicate the relative positions of two substituents on a double bond.
If two substituents are on the same side of the double bond, they are cis. If they are on opposite sides of the double bond, they are trans.
In the case of a purple screen, the parent chain is the screen itself. There are no substituents, so the IUPAC name of the substance is simply "screen".