Are the three isomers for C2H2F2:

cis-1,2-difluroethylene
trans- 1,2-difluroethylene
1,1-difluroethylene or 1,2-difluroethylene

or all these all the wrong names.

Since you don't draw the structures (and it's almost impossible to do it on these boards) I can't tell you if the name is correct or not. However,

there is a cis-1,2-difluoroethylene, a trans-1,2-difluoroethylene, and a 1,1-difluoroethylene. The name of 1,2-difluoroethylene isn't complete; i.e., it needs to be preceded with a cis or a trans designation. That gives you the three isomers.

The names you provided are close, but there is a slight mistake. Here are the correct names for the three isomers of C2H2F2:

1. cis-1,2-difluoroethylene
2. trans-1,2-difluoroethylene
3. 1,1-difluoroethylene

To determine the correct names, let's first understand the concept of cis and trans isomers.

Cis and trans isomers are types of geometric isomers. Geometric isomerism occurs when different groups or atoms are arranged differently around a double bond, resulting in distinct spatial arrangements of the molecule. In the case of C2H2F2, the molecule contains a double bond between the two carbon atoms.

Now, let's determine the correct names for the isomers:

1. cis-1,2-difluoroethylene:
In this isomer, the two fluorine atoms (F) are on the same side of the double bond. The ‘cis’ prefix indicates this specific spatial arrangement.

2. trans-1,2-difluoroethylene:
In this isomer, the two fluorine atoms (F) are on opposite sides of the double bond. The ‘trans’ prefix indicates this specific spatial arrangement.

3. 1,1-difluoroethylene:
This isomer has both fluorine atoms (F) attached to the same carbon atom. It is not a geometric isomer because there is no potential for different spatial arrangements around the double bond.

Therefore, the correct names for the three isomers of C2H2F2 are cis-1,2-difluoroethylene, trans-1,2-difluoroethylene, and 1,1-difluoroethylene.

The three isomers for C2H2F2 are:

1. cis-1,2-difluoroethylene
2. trans-1,2-difluoroethylene
3. 1,1-difluoroethylene

So, all the names you provided are correct.