Question

why n hexane has higher melting point than n pentane

Answer 1

beacause the molecular massof hexane is larger than pentane and melting and boiling point are directly proportional to the molecular mass .
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Answer 2

Assuming that by hexane you mean n-hexane I'll say that n-hexane has a greater boiling point than n-pentane. This is because of greater surface area of n-hexane than n-pentane