Question

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Answer 1

According to IUPAC nomenclature, these isomers are called simply butane and 2-methylpropane. Notice that isobutane has a propane parent chain with a methyl group - CH3 attached to the second carbon of the chain - that is why its IUPAC name is 2-methylpropane.

Answer 2

Isomers are those compounds which have same molecular formula but different structural formula.

We cannot obtain Isomers of first 3 members of alkane series because branching isn't possible for first three members of alkane.If branching will not be possible than structural formula cannot be different and hence isomers are not possible.

Here is the pic for isomers of butane.

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