How many structural isomers are there for C₂H₄Cl₂?

Question

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In this molecule, there are two sulfur atoms, each bonded to a chlorine atom and two carbon atoms (C₂Cl₂ and C₄Cl₂). The other carbon atoms are bonded to hydrogen or a methyl group. The two possible isomers are distinguished by the placement of the methyl groups on the carbon atoms bonded to the sulfur atoms. One isomer has both methyl groups on the same side of the molecule, while the other has them on opposite sides.

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How Many Structural Isomers Are There for C₂H₄Cl₂