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[Ter]

Why doesn't this have isomers? Please explain it to me, thank you very much really!

[Hunter2]

The molecule itself has no isomer. But if you exchange X with Y then you have the possibility of 3 isomers.

1,1 Di(X)-2,2 di(Y) Ethylene, cis-1,2 Di(X)-1,2 di(Y) Ethylene, trans-1,2 Di(X)-1,2 di(Y) Ethylene

[Borek]

What is an isomer? What kind of isomers do you think would be possible?

[Ter]

From what I know, an isomer is the different structural arrangement of atoms within the molecule.

Since the atoms can 'move', then it can have isomers can't it? eg. X placed diagonally within the molecule like a trans isomer, I was thinking that the isomers would be cis and trans since the atoms can be moved.

Please correct me, I know I am wrong here but I really dont know why,

[Borek]

What do you mean by "atoms can move"? When you exchange X with Y (or R₁ with R₂) you will get a different molecule.

[curiouscat]

The molecule itself has no isomer.

It does, I think. The ones you wrote.

[curiouscat]

What do you mean by "atoms can move"? When you exchange X with Y (or R₁ with R₂) you will get a different molecule.

Which is an isomer of the parent molecule.

[discodermolide]

Don't forget the plane of symmetry.
As drawn there is one trans isomer.