Answer : Because Isobutana and n-Butane has a different structure, so that the physical properties of compounds are also different isomers.
But they have similar chemical properties.
Isobutana have a more complicated structure dalamakibat attractive force between molecules is smaller than the straight chain structure that is easy to evaporate.
This is because Isobutana which is also called branched Alkanes have a boiling point and melting point lower than the n-Butane (not branched).
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