Which is the smallest alkane that exhibits is | vedclass

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(D) Isomerism in alkanes requires the presence of at least $4$ carbon atoms to form branched structures.For $n=1, 2, 3$,only straight-chain alkanes ex

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$4$ carbons

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(D) Isomerism in alkanes requires the presence of at least $4$ carbon atoms to form branched structures.For $n=1, 2, 3$,only straight-chain alkanes exist (methane,ethane,propane).For $n=4$,we have $n$-butane $(CH_3-CH_2-CH_2-CH_3)$ and isobutane $(CH_3-CH(CH_3)-CH_3)$,which are structural isomers.Therefore,the smallest alkane exhibiting isomerism is butane,which contains $4$ carbon atoms.

Which is the smallest alkane that exhibits isomerism?

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