How many structural and cis-trans isomers are there for dichloropropene, C3 H4 Cl

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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?
 

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  • #2
Borek
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7 there are.

List those you have (or draw them).
 
  • #3
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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 cant find anymore!
 
  • #4
Borek
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What if neither Cl atom is in the 1 position?
 

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