Which of the hydrocarbons has highest boiling points?

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2,2-Dimethyl propane

n-pentane

n-Hexane

2-Methyl butane

answer is C.

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Detailed Solution

Boiling point increases with increase in C-content due to the increase in surface area and hence, van der Waal's forces of attraction and the boiling point increase.
Branched chain isomers have lower boiling point than corresponding straight chain alkanes.
Boiling point order:
n-Hexane > n-pentane > 2-Methyl butane > 2,2-Dimethyl propane

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