What Are the 7 Isomers of Dichloropropene, C3H4Cl2?

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SUMMARY

The discussion identifies a total of seven isomers for dichloropropene (C3H4Cl2), which includes four structural isomers and three cis-trans isomers. The confirmed isomers are 1,1-dichloropropene, 1,2-dichloropropene (with cis and trans forms), and 1,3-dichloropropene (also with cis and trans forms). The confusion arises from the structural variations and the inclusion of cis-trans isomerism, which significantly increases the total count of isomers. Participants in the discussion emphasize the importance of considering all possible configurations of chlorine atoms on the propene backbone.

PREREQUISITES
  • Understanding of isomerism, including structural and cis-trans isomers.
  • Familiarity with organic chemistry nomenclature and molecular structures.
  • Knowledge of the properties and reactions of alkenes.
  • Basic skills in drawing chemical structures and visualizing molecular geometry.
NEXT STEPS
  • Research the structural formulas of all seven isomers of dichloropropene.
  • Study the principles of cis-trans isomerism in alkenes.
  • Explore the reactivity and applications of dichloropropene in organic synthesis.
  • Learn about stereochemistry and its implications in chemical reactions.
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Chemistry students, organic chemists, and educators seeking to deepen their understanding of isomerism and the properties of dichloropropene.

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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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