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The melting points and boiling points fo...

The melting points and boiling points for two `C_(8)H_(18 )` isomers are given Explain why `CH_(3)(CH_(2))_(6)CH_(3)` has a lower melting point but higher biling point

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n-octane has higher boiling point due to stronger van der Waal's interaction operating between various molecules of n-octane due to its larger surface area than that of 2,2,3,3 -tetramethyl butane. However due to more spherical geometry better stacking is present in 2,2,3,3-tetramethyl butane which results into higher melting point.
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