So basically this is the question:
"There are nine structural isomers of molecular formula C4H8Br2 , three of which have branched carbon chains. Give the names and draw the graphical formulae for any two of the branched chain isomers of C4H8Br2."
So basically I did the question (I did one isomer) and I got 2,2-dibromobutane. However I looked at the mark scheme and the only answers acceptable are:
1,1-dibromo-(2-) methylpropane
1,2-dibromo-(2-)methylpropane
1,3-dibromo-(2-) methylpropane
But I don't understand how you would get those answers. So if anyone could explain it to me I'd be so thankful! x
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