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What is the order of the boiling points ...

What is the order of the boiling points of following alkanes explain
(I). `CH_(3)-(CH_(2))_(4)-CH_3`
(II). `CH_(3)-CH_(2)-CH(CH_(3))-CH_(2)-CH_(3)`
(III). `CH_(3)-C(CH_(3))_(2)-CH_(2)-CH_(3)`

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IIIgtIIgtI
2,2-Dimethyl butane is more branched, more spherical and has smallest surface area. N-Hexane has the longest carbon chain and largest surface area. Larger the surface area, greater is the boiling point.
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