I know that the structural isomers of C6H14 are hexane, 2-methylpentane, 3-methylpentane, , 2,3-dimethylbutane and 2,2-dimethylbutane.
However, why are 1-methylpentane or 1,2-dimethylbutane not isomers?
However, why are 1-methylpentane or 1,2-dimethylbutane not isomers?
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Because if you add a methyl group at carbon atom 1 you are actually extending the chain so 1- methylpentane is the same as hexane.
CH3CH2CH2CH2CH2-CH3
Similarly 1,2-dimethylbutane is 3-methylpentane
CH3CH2CH2CH2CH2-CH3
Similarly 1,2-dimethylbutane is 3-methylpentane