How many different isomers can be derived from ethylene if two hydrogen atoms are replaced by a fl uorine atom and a chlorine atom? draw their structures and name them. indicate which are structural isomers and which are geometric isomers?

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03-05-2018
Chemistry

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How many different isomers can be derived from ethylene if two hydrogen atoms are replaced by a fl uorine atom and a chlorine atom? draw their structures and name them. indicate which are structural isomers and which are geometric isomers?

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Answer:
THREE different isomers can be derived from ethylene if two hydrogen atoms are replaced by a fl uorine atom and a chlorine atom.

Explanation:
When two Hydrogen atoms in ethylene (C₂H₄) are replaced with Fluorine and Chlorine atom then the new molecular formula is C₂H₂FCl.
Compounds having same Molecular formula but different structural formula are called as Isomers.
First Isomer of C₂H₂FCl is 1-chloro-1-fluoroethene, in which F and Cl at geminal position (attached to same Carbon atom).
Other two Isomers are Geometrical Isomers of 1-chloro-2-fluoroethene, in which F and Cl at different carbon atom and having different position is space. The one in which both F and Cl at opposite side forms (trans)-1-chloro-2-fluoroethene and the one in which both are in same side is called as (cis)-1-chloro-2-fluoroethene.