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    Pentane has 3 chain isomers.

    in the 2-methylbutane cant you just located the methyl in another area and call it something else and that would be another isomer?
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    (Original post by Tynos)
    Pentane has 3 chain isomers.

    in the 2-methylbutane cant you just located the methyl in another area and call it something else and that would be another isomer?
    No. It's on carbon 2, so think what would happen if you put it on carbon 1,3 or 4.

    On carbons one and four, it would create a 5 carbon chain, so it isn't a methylbutane isomer, but rather pentane.
    As for carbon three, remember that in naming you number the carbon chain so as to give the lowest sum when the locations of all the substituents is added up - so 3-methylbutane is actually just 2-methylbutane.
 
 
 
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