What is the cis or trans name for ch3brc=cclch3??

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In naming this 4-carbon alkene first we have to locate the double bond. It is in the second carbon and therefore it is called 2-butene or but-2-ene. Next, we consider the substituent in the molecule. We can notice that there is a Br and a Cl attached to the second and third carbon. Alphabetically, Bromine should be named first and therefore the carbon where Br is attached is named as the Carbon 2; carbon 3 is not the carbon where Cl is attached. 

So we can partially name it as 2-bromo-3-chloro-but-2-ene. 

Now it is up to you whether it is a cis or a trans butene.

trans-2-bromo-3-chloro-but-2-ene

cis-2-bromo-3-chloro-but-2-ene

 

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