How many stereoisomers of C4H8Br2 have structural isomers?

[Snazzy]

Homework Statement

Name the structural isomers of C4H8Br2 and remember to number the carbon atoms such that you minimize the numbers in the name.

How many stuctural isomers of C4H8Br2 are there?

The Attempt at a Solution

I'm not sure how many there should be. So far I've found 9:
1,1-dibromobutane
1,2-dibromobutane
1,3-dibromobutane
1,4-dibromobutane
2,2-dibromobutane
2,3-dibromobutane
1,1-dibromo-2-methylpropane
1,2-dibromo-2-methylpropane
1,3-dibromo-2-methylpropaneAre there anymore that I'm missing? I can't seem to find them.

 

[Kalirren]

Don't forget chirality.

 

[Snazzy]

I don't think chirality will affect the actual formula name anymore since I've taken care of all chiral forms by putting the Br atoms attached to different carbons.

 

[Kalirren]

Oh, you're right. Structural isormers, not stereoisomers.

In that case, I think you've got them all.

 

[ChemIsHard]

How many stereocentres are there?

0 correct?

 

[chemisttree]

How many stereocentres are there?

0 correct?

No, I see at least two from the list given.

 

[ChemIsHard]

1,2-dibromo-2-methylpropane
1,3-dibromo-2-methylpropane

Being the two? The stereocentre is on the first carbon in both cases right?

Sorry for the numerous questions, I'm just a little confused!

 

[chemisttree]

Make a model and try to superimpose 'em.

 

[ChemIsHard]

I found four to have stereocentres:
1,2-dibromobutane
1,3-dibromobutane
2,3-dibromobutane
1,2-dibromo-2-methylpropane

Can anyone confirm this?