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Structural isomers of C4H9Br

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Stupid.03:
Hello everyone, I'm new (both to the forum and to chemistry), I've been trying to draw every structural isomers of C4H9Br, and I found 5 of them. However, on my book it says there are maximum 4, and it gives me the third one I found wrong. How so? Doesn't it have different connections? Why can't it be an isomer?

[uploaded image on imgur]
http://imgur.com/a/JDyZSkk

rolnor:
Is it possible that 2 of you isomeres are the same?

Stupid.03:

--- Quote from: rolnor on July 14, 2021, 08:13:45 AM ---Is it possible that 2 of you isomeres are the same?

--- End quote ---

It must be the case, I thought the third might be the same with the second one, however in the third CH3 is in the same position of Br, in the second not. Is the reasoning correct?

Orcio_Dojek:
No, 3 and 5 are the same.

Babcock_Hall:
When deciding whether or not two representations are the same molecule, there are a couple of approaches.  One is to name them.  Another is to think about rotating carbon-carbon single bonds to see whether or not they interconvert.

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