Compounds that have same molecular formula but different structures are called Isomers. There are many kinds of isomers in organic compounds,
Constitutional Isomers
In the form of n-butane and isobutane, constitutional isomers have the same molecular formula, but different connectivities. The difference between the two butanes lies in which atoms are connected to which (the connectivities), and this is best seen by examining the carbon skeletons.


Note that n- butane is astright chain, whereas isobutane has one branch. The two isomers are different compounds and have different physical and chemical properties, including quite different molecular shapes. A mixture of the two isomers can be physically separated into two pure components. the only common feature they share is their molecular formula C4H10.

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