N-butane and isobutane are both forms of butane, a hydrocarbon with the chemical formula C4H10. The main difference between the two is their molecular structure. N-butane has a straight chain of carbon atoms, while isobutane has a branched chain. This difference in structure affects their physical properties, such as boiling point and density. Isobutane has a lower boiling point and higher density compared to n-butane. **

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n-Butane has a higher boiling point than isobutane because n-butane molecules can pack more closely together due to their linear structure, leading to stronger van der Waals forces between molecules. Isobutane, on the other hand, has a branched structure which prevents the molecules from packing as closely together, resulting in weaker intermolecular forces and a lower boiling point. The stronger intermolecular forces in n-butane require more energy to overcome, hence the higher boiling point. **

Iso-butane and butane have different boiling points because of their molecular structures. Iso-butane has a branched structure, which allows its molecules to pack more closely together, resulting in stronger intermolecular forces. This makes it more difficult to overcome these forces and reach the boiling point compared to butane, which has a linear structure with weaker intermolecular forces. As a result, iso-butane has a higher boiling point than butane. **

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n-Butane has a higher boiling point than 2-methylpropane. This is because n-butane has a straight-chain structure, allowing for stronger intermolecular forces (London dispersion forces) between its molecules compared to the branched structure of 2-methylpropane. The stronger intermolecular forces in n-butane require more energy to overcome, resulting in a higher boiling point. **