What Are the 7 Isomers of Dichloropropene, C3H4Cl2?

[mutineer]

20 How many structural and cis-trans isomers are there for dichloropropene,
C3H4Cl2. I could find a total of 4, with 2 structural and 2 cis trans. But the answer sheet says 7! can someone tell me all the isomers it can form?

 

[Borek]

7 there are.

List those you have (or draw them).

 

[mutineer]

I found five
the first is 1,1 dichloropropene
the second is 1,3 dichloropropene(since this has cis-trans I count it as two)
the fourth is 1,2 dichlropropene (again this shows cis-trans so I count it as two)
Thats it, i can't find anymore!

 

[Borek]

What if neither Cl atom is in the 1 position?