What Are the 7 Isomers of Dichloropropene, C3H4Cl2?

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Discussion Overview

The discussion revolves around the structural and cis-trans isomers of dichloropropene (C3H4Cl2). Participants are exploring the total number of isomers, including structural variations and geometric isomerism.

Discussion Character

  • Exploratory, Debate/contested, Technical explanation

Main Points Raised

  • One participant claims to have identified 4 isomers: 2 structural and 2 cis-trans.
  • Another participant asserts that there are 7 isomers in total and invites others to list or draw them.
  • A third participant lists five isomers, specifying 1,1-dichloropropene, 1,3-dichloropropene (counted as two due to cis-trans), and 1,2-dichloropropene (also counted as two for the same reason).
  • A later reply questions the scenario where neither chlorine atom is in the 1 position, suggesting the possibility of additional isomers.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the total number of isomers, with some asserting there are 4 or 5, while others claim there are 7. The discussion remains unresolved regarding the complete list of isomers.

Contextual Notes

There are limitations in the discussion regarding the assumptions made about isomer counting and the definitions of structural versus cis-trans isomers. Some participants may not have considered all possible configurations.

mutineer
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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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7 there are.

List those you have (or draw them).
 
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!
 
What if neither Cl atom is in the 1 position?
 

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